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Finding the Fourth Proportional to 12,366.80, 18,545.20 and 7,679.87

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Solution

The fourth proportional to 12,366.80, 18,545.20 and 7,679.87 is: 11,516.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,366.80 : 18,545.20 = 7,679.87 : x
  2. Step 2: Convert to fraction form
    12,366.80/18,545.20 = 7,679.87/x
  3. Step 3: Cross multiply
    12,366.80x = 18,545.20 × 7,679.87
  4. Step 4: Simplify right side
    12,366.80x = 142,424,725.12
  5. Step 5: Solve for x
    x = 142,424,725.12/12,366.80
  6. Step 6: Final answer
    x = 11,516.70

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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.