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Finding the Fourth Proportional to 61,149.60, 91,724.40 and 42,487.20

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Solution

The fourth proportional to 61,149.60, 91,724.40 and 42,487.20 is: 63,730.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,149.60 : 91,724.40 = 42,487.20 : x
  2. Step 2: Convert to fraction form
    61,149.60/91,724.40 = 42,487.20/x
  3. Step 3: Cross multiply
    61,149.60x = 91,724.40 × 42,487.20
  4. Step 4: Simplify right side
    61,149.60x = 3,897,112,927.68
  5. Step 5: Solve for x
    x = 3,897,112,927.68/61,149.60
  6. Step 6: Final answer
    x = 63,730.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.