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Finding the Fourth Proportional to 20,572.61, 28,390.22 and 11,620.13

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Solution

The fourth proportional to 20,572.61, 28,390.22 and 11,620.13 is: 16,035.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,572.61 : 28,390.22 = 11,620.13 : x
  2. Step 2: Convert to fraction form
    20,572.61/28,390.22 = 11,620.13/x
  3. Step 3: Cross multiply
    20,572.61x = 28,390.22 × 11,620.13
  4. Step 4: Simplify right side
    20,572.61x = 329,897,847.08
  5. Step 5: Solve for x
    x = 329,897,847.08/20,572.61
  6. Step 6: Final answer
    x = 16,035.78

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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.