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Finding the Fourth Proportional to 91,134.80, 136,721.40 and 38,517.20

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Solution

The fourth proportional to 91,134.80, 136,721.40 and 38,517.20 is: 57,783.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,134.80 : 136,721.40 = 38,517.20 : x
  2. Step 2: Convert to fraction form
    91,134.80/136,721.40 = 38,517.20/x
  3. Step 3: Cross multiply
    91,134.80x = 136,721.40 × 38,517.20
  4. Step 4: Simplify right side
    91,134.80x = 5,266,125,508.08
  5. Step 5: Solve for x
    x = 5,266,125,508.08/91,134.80
  6. Step 6: Final answer
    x = 57,783.91

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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.