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Finding the Fourth Proportional to 71,989.97, 99,348.12 and 45,129.96

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Solution

The fourth proportional to 71,989.97, 99,348.12 and 45,129.96 is: 62,280.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,989.97 : 99,348.12 = 45,129.96 : x
  2. Step 2: Convert to fraction form
    71,989.97/99,348.12 = 45,129.96/x
  3. Step 3: Cross multiply
    71,989.97x = 99,348.12 × 45,129.96
  4. Step 4: Simplify right side
    71,989.97x = 4,483,576,681.68
  5. Step 5: Solve for x
    x = 4,483,576,681.68/71,989.97
  6. Step 6: Final answer
    x = 62,280.58

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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.