Home / 20,286.30-30,429.45-13,287.90

Finding the Fourth Proportional to 20,286.30, 30,429.45 and 13,287.90

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Solution

The fourth proportional to 20,286.30, 30,429.45 and 13,287.90 is: 19,931.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,286.30 : 30,429.45 = 13,287.90 : x
  2. Step 2: Convert to fraction form
    20,286.30/30,429.45 = 13,287.90/x
  3. Step 3: Cross multiply
    20,286.30x = 30,429.45 × 13,287.90
  4. Step 4: Simplify right side
    20,286.30x = 404,343,488.66
  5. Step 5: Solve for x
    x = 404,343,488.66/20,286.30
  6. Step 6: Final answer
    x = 19,931.85

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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.