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Finding the Fourth Proportional to 21,591.20, 32,401.20 and 12,231.20

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Solution

The fourth proportional to 21,591.20, 32,401.20 and 12,231.20 is: 18,354.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,591.20 : 32,401.20 = 12,231.20 : x
  2. Step 2: Convert to fraction form
    21,591.20/32,401.20 = 12,231.20/x
  3. Step 3: Cross multiply
    21,591.20x = 32,401.20 × 12,231.20
  4. Step 4: Simplify right side
    21,591.20x = 396,305,557.44
  5. Step 5: Solve for x
    x = 396,305,557.44/21,591.20
  6. Step 6: Final answer
    x = 18,354.96

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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.