Home / 20,489.60-28,279.86-12,930.86

Finding the Fourth Proportional to 20,489.60, 28,279.86 and 12,930.86

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Solution

The fourth proportional to 20,489.60, 28,279.86 and 12,930.86 is: 17,847.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489.60 : 28,279.86 = 12,930.86 : x
  2. Step 2: Convert to fraction form
    20,489.60/28,279.86 = 12,930.86/x
  3. Step 3: Cross multiply
    20,489.60x = 28,279.86 × 12,930.86
  4. Step 4: Simplify right side
    20,489.60x = 365,682,839.78
  5. Step 5: Solve for x
    x = 365,682,839.78/20,489.60
  6. Step 6: Final answer
    x = 17,847.24

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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.