Home / 20,864.16-28,791.50-12,375.90

Finding the Fourth Proportional to 20,864.16, 28,791.50 and 12,375.90

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Solution

The fourth proportional to 20,864.16, 28,791.50 and 12,375.90 is: 17,078.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,864.16 : 28,791.50 = 12,375.90 : x
  2. Step 2: Convert to fraction form
    20,864.16/28,791.50 = 12,375.90/x
  3. Step 3: Cross multiply
    20,864.16x = 28,791.50 × 12,375.90
  4. Step 4: Simplify right side
    20,864.16x = 356,320,662.97
  5. Step 5: Solve for x
    x = 356,320,662.97/20,864.16
  6. Step 6: Final answer
    x = 17,078.12

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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.