Home / 20,862.38-28,790.69-11,431.55

Finding the Fourth Proportional to 20,862.38, 28,790.69 and 11,431.55

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Solution

The fourth proportional to 20,862.38, 28,790.69 and 11,431.55 is: 15,775.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,862.38 : 28,790.69 = 11,431.55 : x
  2. Step 2: Convert to fraction form
    20,862.38/28,790.69 = 11,431.55/x
  3. Step 3: Cross multiply
    20,862.38x = 28,790.69 × 11,431.55
  4. Step 4: Simplify right side
    20,862.38x = 329,122,011.16
  5. Step 5: Solve for x
    x = 329,122,011.16/20,862.38
  6. Step 6: Final answer
    x = 15,775.86

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Half scale
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Double scale
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Similar ratio
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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.