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Finding the Fourth Proportional to 129,305.52, 178,441.14 and 72,716.88

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Solution

The fourth proportional to 129,305.52, 178,441.14 and 72,716.88 is: 100,349.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,305.52 : 178,441.14 = 72,716.88 : x
  2. Step 2: Convert to fraction form
    129,305.52/178,441.14 = 72,716.88/x
  3. Step 3: Cross multiply
    129,305.52x = 178,441.14 × 72,716.88
  4. Step 4: Simplify right side
    129,305.52x = 12,975,682,964.44
  5. Step 5: Solve for x
    x = 12,975,682,964.44/129,305.52
  6. Step 6: Final answer
    x = 100,349.03

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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.