Home / 20,685.18-28,545.42-11,253.78

Finding the Fourth Proportional to 20,685.18, 28,545.42 and 11,253.78

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Solution

The fourth proportional to 20,685.18, 28,545.42 and 11,253.78 is: 15,530.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.18 : 28,545.42 = 11,253.78 : x
  2. Step 2: Convert to fraction form
    20,685.18/28,545.42 = 11,253.78/x
  3. Step 3: Cross multiply
    20,685.18x = 28,545.42 × 11,253.78
  4. Step 4: Simplify right side
    20,685.18x = 321,243,876.69
  5. Step 5: Solve for x
    x = 321,243,876.69/20,685.18
  6. Step 6: Final answer
    x = 15,530.15

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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.