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Finding the Fourth Proportional to 18,272.75, 25,221.12 and 11,915.20

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Solution

The fourth proportional to 18,272.75, 25,221.12 and 11,915.20 is: 16,446.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,272.75 : 25,221.12 = 11,915.20 : x
  2. Step 2: Convert to fraction form
    18,272.75/25,221.12 = 11,915.20/x
  3. Step 3: Cross multiply
    18,272.75x = 25,221.12 × 11,915.20
  4. Step 4: Simplify right side
    18,272.75x = 300,514,562.92
  5. Step 5: Solve for x
    x = 300,514,562.92/18,272.75
  6. Step 6: Final answer
    x = 16,446.05

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Half scale
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Double scale
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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.