Home / 20,516.83-28,320.15-12,761.68

Finding the Fourth Proportional to 20,516.83, 28,320.15 and 12,761.68

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Solution

The fourth proportional to 20,516.83, 28,320.15 and 12,761.68 is: 17,615.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,516.83 : 28,320.15 = 12,761.68 : x
  2. Step 2: Convert to fraction form
    20,516.83/28,320.15 = 12,761.68/x
  3. Step 3: Cross multiply
    20,516.83x = 28,320.15 × 12,761.68
  4. Step 4: Simplify right side
    20,516.83x = 361,412,691.85
  5. Step 5: Solve for x
    x = 361,412,691.85/20,516.83
  6. Step 6: Final answer
    x = 17,615.43

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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.