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Finding the Fourth Proportional to 2,885.85, 3,979.85 and 1,890.76

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Solution

The fourth proportional to 2,885.85, 3,979.85 and 1,890.76 is: 2,607.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,885.85 : 3,979.85 = 1,890.76 : x
  2. Step 2: Convert to fraction form
    2,885.85/3,979.85 = 1,890.76/x
  3. Step 3: Cross multiply
    2,885.85x = 3,979.85 × 1,890.76
  4. Step 4: Simplify right side
    2,885.85x = 7,524,941.19
  5. Step 5: Solve for x
    x = 7,524,941.19/2,885.85
  6. Step 6: Final answer
    x = 2,607.53

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Find fourth proportional to 1,442.93, 1,989.93 and 945.38
Half scale
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Double scale
Find fourth proportional to 2,886.85, 3,981.23 and 1,891.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.