Home / 20,375.20-28,117.76-11,422.71

Finding the Fourth Proportional to 20,375.20, 28,117.76 and 11,422.71

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Solution

The fourth proportional to 20,375.20, 28,117.76 and 11,422.71 is: 15,763.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,375.20 : 28,117.76 = 11,422.71 : x
  2. Step 2: Convert to fraction form
    20,375.20/28,117.76 = 11,422.71/x
  3. Step 3: Cross multiply
    20,375.20x = 28,117.76 × 11,422.71
  4. Step 4: Simplify right side
    20,375.20x = 321,180,948.04
  5. Step 5: Solve for x
    x = 321,180,948.04/20,375.20
  6. Step 6: Final answer
    x = 15,763.33

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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.