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Finding the Fourth Proportional to 129,679.85, 178,958.97 and 72,322.79

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Solution

The fourth proportional to 129,679.85, 178,958.97 and 72,322.79 is: 99,805.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,679.85 : 178,958.97 = 72,322.79 : x
  2. Step 2: Convert to fraction form
    129,679.85/178,958.97 = 72,322.79/x
  3. Step 3: Cross multiply
    129,679.85x = 178,958.97 × 72,322.79
  4. Step 4: Simplify right side
    129,679.85x = 12,942,812,005.93
  5. Step 5: Solve for x
    x = 12,942,812,005.93/129,679.85
  6. Step 6: Final answer
    x = 99,805.88

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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.