Home / 20,620.29-28,456.33-11,188.85

Finding the Fourth Proportional to 20,620.29, 28,456.33 and 11,188.85

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Solution

The fourth proportional to 20,620.29, 28,456.33 and 11,188.85 is: 15,440.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.29 : 28,456.33 = 11,188.85 : x
  2. Step 2: Convert to fraction form
    20,620.29/28,456.33 = 11,188.85/x
  3. Step 3: Cross multiply
    20,620.29x = 28,456.33 × 11,188.85
  4. Step 4: Simplify right side
    20,620.29x = 318,393,607.92
  5. Step 5: Solve for x
    x = 318,393,607.92/20,620.29
  6. Step 6: Final answer
    x = 15,440.79

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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.