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Finding the Fourth Proportional to 90,902.60, 136,572.60 and 81,279.80

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Solution

The fourth proportional to 90,902.60, 136,572.60 and 81,279.80 is: 122,115.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,902.60 : 136,572.60 = 81,279.80 : x
  2. Step 2: Convert to fraction form
    90,902.60/136,572.60 = 81,279.80/x
  3. Step 3: Cross multiply
    90,902.60x = 136,572.60 × 81,279.80
  4. Step 4: Simplify right side
    90,902.60x = 11,100,593,613.48
  5. Step 5: Solve for x
    x = 11,100,593,613.48/90,902.60
  6. Step 6: Final answer
    x = 122,115.25

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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.