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Finding the Fourth Proportional to 90,782.80, 136,125.60 and 38,132.80

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Solution

The fourth proportional to 90,782.80, 136,125.60 and 38,132.80 is: 57,178.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,782.80 : 136,125.60 = 38,132.80 : x
  2. Step 2: Convert to fraction form
    90,782.80/136,125.60 = 38,132.80/x
  3. Step 3: Cross multiply
    90,782.80x = 136,125.60 × 38,132.80
  4. Step 4: Simplify right side
    90,782.80x = 5,190,850,279.68
  5. Step 5: Solve for x
    x = 5,190,850,279.68/90,782.80
  6. Step 6: Final answer
    x = 57,178.79

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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.