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Finding the Fourth Proportional to 129,716.76, 179,008.20 and 75,990.24

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Solution

The fourth proportional to 129,716.76, 179,008.20 and 75,990.24 is: 104,865.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,716.76 : 179,008.20 = 75,990.24 : x
  2. Step 2: Convert to fraction form
    129,716.76/179,008.20 = 75,990.24/x
  3. Step 3: Cross multiply
    129,716.76x = 179,008.20 × 75,990.24
  4. Step 4: Simplify right side
    129,716.76x = 13,602,876,079.97
  5. Step 5: Solve for x
    x = 13,602,876,079.97/129,716.76
  6. Step 6: Final answer
    x = 104,865.99

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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.