Home / 20,751.08-31,126.59-8,279.86

Finding the Fourth Proportional to 20,751.08, 31,126.59 and 8,279.86

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Solution

The fourth proportional to 20,751.08, 31,126.59 and 8,279.86 is: 12,419.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,751.08 : 31,126.59 = 8,279.86 : x
  2. Step 2: Convert to fraction form
    20,751.08/31,126.59 = 8,279.86/x
  3. Step 3: Cross multiply
    20,751.08x = 31,126.59 × 8,279.86
  4. Step 4: Simplify right side
    20,751.08x = 257,723,766.08
  5. Step 5: Solve for x
    x = 257,723,766.08/20,751.08
  6. Step 6: Final answer
    x = 12,419.78

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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.