Home / 20,951.13-28,913.10-11,391.66

Finding the Fourth Proportional to 20,951.13, 28,913.10 and 11,391.66

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Solution

The fourth proportional to 20,951.13, 28,913.10 and 11,391.66 is: 15,720.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,951.13 : 28,913.10 = 11,391.66 : x
  2. Step 2: Convert to fraction form
    20,951.13/28,913.10 = 11,391.66/x
  3. Step 3: Cross multiply
    20,951.13x = 28,913.10 × 11,391.66
  4. Step 4: Simplify right side
    20,951.13x = 329,368,204.75
  5. Step 5: Solve for x
    x = 329,368,204.75/20,951.13
  6. Step 6: Final answer
    x = 15,720.78

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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.