Home / 20,997.42-28,976.22-11,565.78

Finding the Fourth Proportional to 20,997.42, 28,976.22 and 11,565.78

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Solution

The fourth proportional to 20,997.42, 28,976.22 and 11,565.78 is: 15,960.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,997.42 : 28,976.22 = 11,565.78 : x
  2. Step 2: Convert to fraction form
    20,997.42/28,976.22 = 11,565.78/x
  3. Step 3: Cross multiply
    20,997.42x = 28,976.22 × 11,565.78
  4. Step 4: Simplify right side
    20,997.42x = 335,132,585.75
  5. Step 5: Solve for x
    x = 335,132,585.75/20,997.42
  6. Step 6: Final answer
    x = 15,960.66

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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.