Home / 20,560.18-28,373.07-11,128.72

Finding the Fourth Proportional to 20,560.18, 28,373.07 and 11,128.72

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Solution

The fourth proportional to 20,560.18, 28,373.07 and 11,128.72 is: 15,357.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,560.18 : 28,373.07 = 11,128.72 : x
  2. Step 2: Convert to fraction form
    20,560.18/28,373.07 = 11,128.72/x
  3. Step 3: Cross multiply
    20,560.18x = 28,373.07 × 11,128.72
  4. Step 4: Simplify right side
    20,560.18x = 315,755,951.57
  5. Step 5: Solve for x
    x = 315,755,951.57/20,560.18
  6. Step 6: Final answer
    x = 15,357.65

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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.