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Finding the Fourth Proportional to 71,725.99, 108,126.17 and 66,909.12

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Solution

The fourth proportional to 71,725.99, 108,126.17 and 66,909.12 is: 100,864.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,725.99 : 108,126.17 = 66,909.12 : x
  2. Step 2: Convert to fraction form
    71,725.99/108,126.17 = 66,909.12/x
  3. Step 3: Cross multiply
    71,725.99x = 108,126.17 × 66,909.12
  4. Step 4: Simplify right side
    71,725.99x = 7,234,627,050.94
  5. Step 5: Solve for x
    x = 7,234,627,050.94/71,725.99
  6. Step 6: Final answer
    x = 100,864.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.