Home / 20,747.31-28,633.85-12,679.30

Finding the Fourth Proportional to 20,747.31, 28,633.85 and 12,679.30

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Solution

The fourth proportional to 20,747.31, 28,633.85 and 12,679.30 is: 17,499.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,747.31 : 28,633.85 = 12,679.30 : x
  2. Step 2: Convert to fraction form
    20,747.31/28,633.85 = 12,679.30/x
  3. Step 3: Cross multiply
    20,747.31x = 28,633.85 × 12,679.30
  4. Step 4: Simplify right side
    20,747.31x = 363,057,265.57
  5. Step 5: Solve for x
    x = 363,057,265.57/20,747.31
  6. Step 6: Final answer
    x = 17,499.01

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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.