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Finding the Fourth Proportional to 71,985.86, 99,335.92 and 39,720.86

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Solution

The fourth proportional to 71,985.86, 99,335.92 and 39,720.86 is: 54,812.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,985.86 : 99,335.92 = 39,720.86 : x
  2. Step 2: Convert to fraction form
    71,985.86/99,335.92 = 39,720.86/x
  3. Step 3: Cross multiply
    71,985.86x = 99,335.92 × 39,720.86
  4. Step 4: Simplify right side
    71,985.86x = 3,945,708,171.29
  5. Step 5: Solve for x
    x = 3,945,708,171.29/71,985.86
  6. Step 6: Final answer
    x = 54,812.27

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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.