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Finding the Fourth Proportional to 173.80, 239.65 and 121.42

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Solution

The fourth proportional to 173.80, 239.65 and 121.42 is: 167.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.80 : 239.65 = 121.42 : x
  2. Step 2: Convert to fraction form
    173.80/239.65 = 121.42/x
  3. Step 3: Cross multiply
    173.80x = 239.65 × 121.42
  4. Step 4: Simplify right side
    173.80x = 29,098.30
  5. Step 5: Solve for x
    x = 29,098.30/173.80
  6. Step 6: Final answer
    x = 167.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.