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Finding the Fourth Proportional to 139.49, 209.25 and 57.22

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Solution

The fourth proportional to 139.49, 209.25 and 57.22 is: 85.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.49 : 209.25 = 57.22 : x
  2. Step 2: Convert to fraction form
    139.49/209.25 = 57.22/x
  3. Step 3: Cross multiply
    139.49x = 209.25 × 57.22
  4. Step 4: Simplify right side
    139.49x = 11,972.76
  5. Step 5: Solve for x
    x = 11,972.76/139.49
  6. Step 6: Final answer
    x = 85.83

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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.