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Finding the Fourth Proportional to 2,891.85, 3,990.54 and 1,895.55

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Solution

The fourth proportional to 2,891.85, 3,990.54 and 1,895.55 is: 2,615.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,891.85 : 3,990.54 = 1,895.55 : x
  2. Step 2: Convert to fraction form
    2,891.85/3,990.54 = 1,895.55/x
  3. Step 3: Cross multiply
    2,891.85x = 3,990.54 × 1,895.55
  4. Step 4: Simplify right side
    2,891.85x = 7,564,268.10
  5. Step 5: Solve for x
    x = 7,564,268.10/2,891.85
  6. Step 6: Final answer
    x = 2,615.72

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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.