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Finding the Fourth Proportional to 138.89, 208.43 and 104.73

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Solution

The fourth proportional to 138.89, 208.43 and 104.73 is: 157.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.89 : 208.43 = 104.73 : x
  2. Step 2: Convert to fraction form
    138.89/208.43 = 104.73/x
  3. Step 3: Cross multiply
    138.89x = 208.43 × 104.73
  4. Step 4: Simplify right side
    138.89x = 21,828.87
  5. Step 5: Solve for x
    x = 21,828.87/138.89
  6. Step 6: Final answer
    x = 157.17

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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.