Home / 81,082.53-121,540.32-31,149.09

Finding the Fourth Proportional to 81,082.53, 121,540.32 and 31,149.09

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Solution

The fourth proportional to 81,082.53, 121,540.32 and 31,149.09 is: 46,691.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,082.53 : 121,540.32 = 31,149.09 : x
  2. Step 2: Convert to fraction form
    81,082.53/121,540.32 = 31,149.09/x
  3. Step 3: Cross multiply
    81,082.53x = 121,540.32 × 31,149.09
  4. Step 4: Simplify right side
    81,082.53x = 3,785,870,366.31
  5. Step 5: Solve for x
    x = 3,785,870,366.31/81,082.53
  6. Step 6: Final answer
    x = 46,691.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.