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Finding the Fourth Proportional to 125,138.68, 172,649.12 and 71,385.86

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Solution

The fourth proportional to 125,138.68, 172,649.12 and 71,385.86 is: 98,488.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,138.68 : 172,649.12 = 71,385.86 : x
  2. Step 2: Convert to fraction form
    125,138.68/172,649.12 = 71,385.86/x
  3. Step 3: Cross multiply
    125,138.68x = 172,649.12 × 71,385.86
  4. Step 4: Simplify right side
    125,138.68x = 12,324,705,909.44
  5. Step 5: Solve for x
    x = 12,324,705,909.44/125,138.68
  6. Step 6: Final answer
    x = 98,488.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.