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Finding the Fourth Proportional to 2,185.86, 3,278.83 and 646.86

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Solution

The fourth proportional to 2,185.86, 3,278.83 and 646.86 is: 970.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,185.86 : 3,278.83 = 646.86 : x
  2. Step 2: Convert to fraction form
    2,185.86/3,278.83 = 646.86/x
  3. Step 3: Cross multiply
    2,185.86x = 3,278.83 × 646.86
  4. Step 4: Simplify right side
    2,185.86x = 2,120,943.97
  5. Step 5: Solve for x
    x = 2,120,943.97/2,185.86
  6. Step 6: Final answer
    x = 970.30

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.