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Finding the Fourth Proportional to 20,472.60, 30,659.68 and 11,680.86

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Solution

The fourth proportional to 20,472.60, 30,659.68 and 11,680.86 is: 17,493.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,472.60 : 30,659.68 = 11,680.86 : x
  2. Step 2: Convert to fraction form
    20,472.60/30,659.68 = 11,680.86/x
  3. Step 3: Cross multiply
    20,472.60x = 30,659.68 × 11,680.86
  4. Step 4: Simplify right side
    20,472.60x = 358,131,276.43
  5. Step 5: Solve for x
    x = 358,131,276.43/20,472.60
  6. Step 6: Final answer
    x = 17,493.20

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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.