Home / 20,620.38-28,456.11-11,188.92

Finding the Fourth Proportional to 20,620.38, 28,456.11 and 11,188.92

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Solution

The fourth proportional to 20,620.38, 28,456.11 and 11,188.92 is: 15,440.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.38 : 28,456.11 = 11,188.92 : x
  2. Step 2: Convert to fraction form
    20,620.38/28,456.11 = 11,188.92/x
  3. Step 3: Cross multiply
    20,620.38x = 28,456.11 × 11,188.92
  4. Step 4: Simplify right side
    20,620.38x = 318,393,138.30
  5. Step 5: Solve for x
    x = 318,393,138.30/20,620.38
  6. Step 6: Final answer
    x = 15,440.70

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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.