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Finding the Fourth Proportional to 66,819.90, 100,124.10 and 54,279.12

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Solution

The fourth proportional to 66,819.90, 100,124.10 and 54,279.12 is: 81,332.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,819.90 : 100,124.10 = 54,279.12 : x
  2. Step 2: Convert to fraction form
    66,819.90/100,124.10 = 54,279.12/x
  3. Step 3: Cross multiply
    66,819.90x = 100,124.10 × 54,279.12
  4. Step 4: Simplify right side
    66,819.90x = 5,434,648,038.79
  5. Step 5: Solve for x
    x = 5,434,648,038.79/66,819.90
  6. Step 6: Final answer
    x = 81,332.78

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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.