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Finding the Fourth Proportional to 12,658.71, 18,988.07 and 8,279.85

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Solution

The fourth proportional to 12,658.71, 18,988.07 and 8,279.85 is: 12,419.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,658.71 : 18,988.07 = 8,279.85 : x
  2. Step 2: Convert to fraction form
    12,658.71/18,988.07 = 8,279.85/x
  3. Step 3: Cross multiply
    12,658.71x = 18,988.07 × 8,279.85
  4. Step 4: Simplify right side
    12,658.71x = 157,218,447.77
  5. Step 5: Solve for x
    x = 157,218,447.77/12,658.71
  6. Step 6: Final answer
    x = 12,419.78

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.