Home / 20,679.18-28,537.14-11,247.78

Finding the Fourth Proportional to 20,679.18, 28,537.14 and 11,247.78

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Solution

The fourth proportional to 20,679.18, 28,537.14 and 11,247.78 is: 15,521.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,679.18 : 28,537.14 = 11,247.78 : x
  2. Step 2: Convert to fraction form
    20,679.18/28,537.14 = 11,247.78/x
  3. Step 3: Cross multiply
    20,679.18x = 28,537.14 × 11,247.78
  4. Step 4: Simplify right side
    20,679.18x = 320,979,472.55
  5. Step 5: Solve for x
    x = 320,979,472.55/20,679.18
  6. Step 6: Final answer
    x = 15,521.87

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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.