Home / 20,512.80-28,123.02-20,139.12

Finding the Fourth Proportional to 20,512.80, 28,123.02 and 20,139.12

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Solution

The fourth proportional to 20,512.80, 28,123.02 and 20,139.12 is: 27,610.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,512.80 : 28,123.02 = 20,139.12 : x
  2. Step 2: Convert to fraction form
    20,512.80/28,123.02 = 20,139.12/x
  3. Step 3: Cross multiply
    20,512.80x = 28,123.02 × 20,139.12
  4. Step 4: Simplify right side
    20,512.80x = 566,372,874.54
  5. Step 5: Solve for x
    x = 566,372,874.54/20,512.80
  6. Step 6: Final answer
    x = 27,610.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.