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Finding the Fourth Proportional to 71,687.55, 98,930.42 and 39,420.12

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Solution

The fourth proportional to 71,687.55, 98,930.42 and 39,420.12 is: 54,400.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,687.55 : 98,930.42 = 39,420.12 : x
  2. Step 2: Convert to fraction form
    71,687.55/98,930.42 = 39,420.12/x
  3. Step 3: Cross multiply
    71,687.55x = 98,930.42 × 39,420.12
  4. Step 4: Simplify right side
    71,687.55x = 3,899,849,571.50
  5. Step 5: Solve for x
    x = 3,899,849,571.50/71,687.55
  6. Step 6: Final answer
    x = 54,400.65

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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.