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Finding the Fourth Proportional to 71,520.53, 98,695.01 and 39,689.15

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Solution

The fourth proportional to 71,520.53, 98,695.01 and 39,689.15 is: 54,769.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,520.53 : 98,695.01 = 39,689.15 : x
  2. Step 2: Convert to fraction form
    71,520.53/98,695.01 = 39,689.15/x
  3. Step 3: Cross multiply
    71,520.53x = 98,695.01 × 39,689.15
  4. Step 4: Simplify right side
    71,520.53x = 3,917,120,857.70
  5. Step 5: Solve for x
    x = 3,917,120,857.70/71,520.53
  6. Step 6: Final answer
    x = 54,769.18

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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.