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Finding the Fourth Proportional to 20,471.61, 30,658.20 and 11,679.87

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Solution

The fourth proportional to 20,471.61, 30,658.20 and 11,679.87 is: 17,491.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,471.61 : 30,658.20 = 11,679.87 : x
  2. Step 2: Convert to fraction form
    20,471.61/30,658.20 = 11,679.87/x
  3. Step 3: Cross multiply
    20,471.61x = 30,658.20 × 11,679.87
  4. Step 4: Simplify right side
    20,471.61x = 358,083,790.43
  5. Step 5: Solve for x
    x = 358,083,790.43/20,471.61
  6. Step 6: Final answer
    x = 17,491.73

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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.