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Finding the Fourth Proportional to 139.29, 208.75 and 104.73

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Solution

The fourth proportional to 139.29, 208.75 and 104.73 is: 156.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.29 : 208.75 = 104.73 : x
  2. Step 2: Convert to fraction form
    139.29/208.75 = 104.73/x
  3. Step 3: Cross multiply
    139.29x = 208.75 × 104.73
  4. Step 4: Simplify right side
    139.29x = 21,862.39
  5. Step 5: Solve for x
    x = 21,862.39/139.29
  6. Step 6: Final answer
    x = 156.96

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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.