Home / 21,331.20-31,996.80-13,545.60

Finding the Fourth Proportional to 21,331.20, 31,996.80 and 13,545.60

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Solution

The fourth proportional to 21,331.20, 31,996.80 and 13,545.60 is: 20,318.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,331.20 : 31,996.80 = 13,545.60 : x
  2. Step 2: Convert to fraction form
    21,331.20/31,996.80 = 13,545.60/x
  3. Step 3: Cross multiply
    21,331.20x = 31,996.80 × 13,545.60
  4. Step 4: Simplify right side
    21,331.20x = 433,415,854.08
  5. Step 5: Solve for x
    x = 433,415,854.08/21,331.20
  6. Step 6: Final answer
    x = 20,318.40

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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.