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Finding the Fourth Proportional to 129,931.20, 195,042.60 and 100,479.60

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Solution

The fourth proportional to 129,931.20, 195,042.60 and 100,479.60 is: 150,832.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,931.20 : 195,042.60 = 100,479.60 : x
  2. Step 2: Convert to fraction form
    129,931.20/195,042.60 = 100,479.60/x
  3. Step 3: Cross multiply
    129,931.20x = 195,042.60 × 100,479.60
  4. Step 4: Simplify right side
    129,931.20x = 19,597,802,430.96
  5. Step 5: Solve for x
    x = 19,597,802,430.96/129,931.20
  6. Step 6: Final answer
    x = 150,832.15

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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.