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Finding the Fourth Proportional to 71,539.78, 98,707.10 and 39,700.70

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Solution

The fourth proportional to 71,539.78, 98,707.10 and 39,700.70 is: 54,777.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,539.78 : 98,707.10 = 39,700.70 : x
  2. Step 2: Convert to fraction form
    71,539.78/98,707.10 = 39,700.70/x
  3. Step 3: Cross multiply
    71,539.78x = 98,707.10 × 39,700.70
  4. Step 4: Simplify right side
    71,539.78x = 3,918,740,964.97
  5. Step 5: Solve for x
    x = 3,918,740,964.97/71,539.78
  6. Step 6: Final answer
    x = 54,777.09

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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.