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Finding the Fourth Proportional to 90,780.60, 136,008.90 and 43,930.20

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Solution

The fourth proportional to 90,780.60, 136,008.90 and 43,930.20 is: 65,816.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,780.60 : 136,008.90 = 43,930.20 : x
  2. Step 2: Convert to fraction form
    90,780.60/136,008.90 = 43,930.20/x
  3. Step 3: Cross multiply
    90,780.60x = 136,008.90 × 43,930.20
  4. Step 4: Simplify right side
    90,780.60x = 5,974,898,178.78
  5. Step 5: Solve for x
    x = 5,974,898,178.78/90,780.60
  6. Step 6: Final answer
    x = 65,816.91

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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.