Home / 20,812.38-28,721.16-11,380.92

Finding the Fourth Proportional to 20,812.38, 28,721.16 and 11,380.92

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Solution

The fourth proportional to 20,812.38, 28,721.16 and 11,380.92 is: 15,705.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.38 : 28,721.16 = 11,380.92 : x
  2. Step 2: Convert to fraction form
    20,812.38/28,721.16 = 11,380.92/x
  3. Step 3: Cross multiply
    20,812.38x = 28,721.16 × 11,380.92
  4. Step 4: Simplify right side
    20,812.38x = 326,873,224.27
  5. Step 5: Solve for x
    x = 326,873,224.27/20,812.38
  6. Step 6: Final answer
    x = 15,705.71

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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.