Home / 20,687.18-28,548.12-11,255.75

Finding the Fourth Proportional to 20,687.18, 28,548.12 and 11,255.75

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Solution

The fourth proportional to 20,687.18, 28,548.12 and 11,255.75 is: 15,532.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.18 : 28,548.12 = 11,255.75 : x
  2. Step 2: Convert to fraction form
    20,687.18/28,548.12 = 11,255.75/x
  3. Step 3: Cross multiply
    20,687.18x = 28,548.12 × 11,255.75
  4. Step 4: Simplify right side
    20,687.18x = 321,330,358.95
  5. Step 5: Solve for x
    x = 321,330,358.95/20,687.18
  6. Step 6: Final answer
    x = 15,532.83

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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.