Home / 20,921.39-28,863.35-11,964.11

Finding the Fourth Proportional to 20,921.39, 28,863.35 and 11,964.11

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Solution

The fourth proportional to 20,921.39, 28,863.35 and 11,964.11 is: 16,505.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.39 : 28,863.35 = 11,964.11 : x
  2. Step 2: Convert to fraction form
    20,921.39/28,863.35 = 11,964.11/x
  3. Step 3: Cross multiply
    20,921.39x = 28,863.35 × 11,964.11
  4. Step 4: Simplify right side
    20,921.39x = 345,324,151.92
  5. Step 5: Solve for x
    x = 345,324,151.92/20,921.39
  6. Step 6: Final answer
    x = 16,505.79

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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.