Home / 81,257.42-121,754.90-31,279

Finding the Fourth Proportional to 81,257.42, 121,754.90 and 31,279

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Solution

The fourth proportional to 81,257.42, 121,754.90 and 31,279 is: 46,867.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,257.42 : 121,754.90 = 31,279 : x
  2. Step 2: Convert to fraction form
    81,257.42/121,754.90 = 31,279/x
  3. Step 3: Cross multiply
    81,257.42x = 121,754.90 × 31,279
  4. Step 4: Simplify right side
    81,257.42x = 3,808,371,517.10
  5. Step 5: Solve for x
    x = 3,808,371,517.10/81,257.42
  6. Step 6: Final answer
    x = 46,867.98

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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.