Home / 20,862.76-28,789.99-11,431.12

Finding the Fourth Proportional to 20,862.76, 28,789.99 and 11,431.12

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Solution

The fourth proportional to 20,862.76, 28,789.99 and 11,431.12 is: 15,774.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,862.76 : 28,789.99 = 11,431.12 : x
  2. Step 2: Convert to fraction form
    20,862.76/28,789.99 = 11,431.12/x
  3. Step 3: Cross multiply
    20,862.76x = 28,789.99 × 11,431.12
  4. Step 4: Simplify right side
    20,862.76x = 329,101,830.49
  5. Step 5: Solve for x
    x = 329,101,830.49/20,862.76
  6. Step 6: Final answer
    x = 15,774.61

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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.