Home / 20,601.28-28,429.80-11,169.88

Finding the Fourth Proportional to 20,601.28, 28,429.80 and 11,169.88

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Solution

The fourth proportional to 20,601.28, 28,429.80 and 11,169.88 is: 15,414.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,601.28 : 28,429.80 = 11,169.88 : x
  2. Step 2: Convert to fraction form
    20,601.28/28,429.80 = 11,169.88/x
  3. Step 3: Cross multiply
    20,601.28x = 28,429.80 × 11,169.88
  4. Step 4: Simplify right side
    20,601.28x = 317,557,454.42
  5. Step 5: Solve for x
    x = 317,557,454.42/20,601.28
  6. Step 6: Final answer
    x = 15,414.45

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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.