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Finding the Fourth Proportional to 129,216.88, 178,315.14 and 71,855.92

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Solution

The fourth proportional to 129,216.88, 178,315.14 and 71,855.92 is: 99,158.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,216.88 : 178,315.14 = 71,855.92 : x
  2. Step 2: Convert to fraction form
    129,216.88/178,315.14 = 71,855.92/x
  3. Step 3: Cross multiply
    129,216.88x = 178,315.14 × 71,855.92
  4. Step 4: Simplify right side
    129,216.88x = 12,812,998,434.63
  5. Step 5: Solve for x
    x = 12,812,998,434.63/129,216.88
  6. Step 6: Final answer
    x = 99,158.86

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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.