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Finding the Fourth Proportional to 71,520.59, 98,695.09 and 39,689.21

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Solution

The fourth proportional to 71,520.59, 98,695.09 and 39,689.21 is: 54,769.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,520.59 : 98,695.09 = 39,689.21 : x
  2. Step 2: Convert to fraction form
    71,520.59/98,695.09 = 39,689.21/x
  3. Step 3: Cross multiply
    71,520.59x = 98,695.09 × 39,689.21
  4. Step 4: Simplify right side
    71,520.59x = 3,917,130,449.33
  5. Step 5: Solve for x
    x = 3,917,130,449.33/71,520.59
  6. Step 6: Final answer
    x = 54,769.27

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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.