Home / 20,378.28-28,121.76-11,425.76

Finding the Fourth Proportional to 20,378.28, 28,121.76 and 11,425.76

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Solution

The fourth proportional to 20,378.28, 28,121.76 and 11,425.76 is: 15,767.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.28 : 28,121.76 = 11,425.76 : x
  2. Step 2: Convert to fraction form
    20,378.28/28,121.76 = 11,425.76/x
  3. Step 3: Cross multiply
    20,378.28x = 28,121.76 × 11,425.76
  4. Step 4: Simplify right side
    20,378.28x = 321,312,480.54
  5. Step 5: Solve for x
    x = 321,312,480.54/20,378.28
  6. Step 6: Final answer
    x = 15,767.40

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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.