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Finding the Fourth Proportional to 173.45, 239.60 and 121.13

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Solution

The fourth proportional to 173.45, 239.60 and 121.13 is: 167.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.45 : 239.60 = 121.13 : x
  2. Step 2: Convert to fraction form
    173.45/239.60 = 121.13/x
  3. Step 3: Cross multiply
    173.45x = 239.60 × 121.13
  4. Step 4: Simplify right side
    173.45x = 29,023.35
  5. Step 5: Solve for x
    x = 29,023.35/173.45
  6. Step 6: Final answer
    x = 167.33

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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.