Home / 20,685.40-28,545.78-11,253.96

Finding the Fourth Proportional to 20,685.40, 28,545.78 and 11,253.96

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Solution

The fourth proportional to 20,685.40, 28,545.78 and 11,253.96 is: 15,530.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.40 : 28,545.78 = 11,253.96 : x
  2. Step 2: Convert to fraction form
    20,685.40/28,545.78 = 11,253.96/x
  3. Step 3: Cross multiply
    20,685.40x = 28,545.78 × 11,253.96
  4. Step 4: Simplify right side
    20,685.40x = 321,253,066.29
  5. Step 5: Solve for x
    x = 321,253,066.29/20,685.40
  6. Step 6: Final answer
    x = 15,530.43

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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.