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Finding the Fourth Proportional to 61,972.40, 85,687.80 and 54,099.20

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Solution

The fourth proportional to 61,972.40, 85,687.80 and 54,099.20 is: 74,801.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,972.40 : 85,687.80 = 54,099.20 : x
  2. Step 2: Convert to fraction form
    61,972.40/85,687.80 = 54,099.20/x
  3. Step 3: Cross multiply
    61,972.40x = 85,687.80 × 54,099.20
  4. Step 4: Simplify right side
    61,972.40x = 4,635,641,429.76
  5. Step 5: Solve for x
    x = 4,635,641,429.76/61,972.40
  6. Step 6: Final answer
    x = 74,801.71

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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.