Home / 20,816.91-28,727.19-11,385.54

Finding the Fourth Proportional to 20,816.91, 28,727.19 and 11,385.54

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Solution

The fourth proportional to 20,816.91, 28,727.19 and 11,385.54 is: 15,711.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,816.91 : 28,727.19 = 11,385.54 : x
  2. Step 2: Convert to fraction form
    20,816.91/28,727.19 = 11,385.54/x
  3. Step 3: Cross multiply
    20,816.91x = 28,727.19 × 11,385.54
  4. Step 4: Simplify right side
    20,816.91x = 327,074,570.83
  5. Step 5: Solve for x
    x = 327,074,570.83/20,816.91
  6. Step 6: Final answer
    x = 15,711.97

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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.