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Finding the Fourth Proportional to 173.56, 239.48 and 121.20

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Solution

The fourth proportional to 173.56, 239.48 and 121.20 is: 167.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.56 : 239.48 = 121.20 : x
  2. Step 2: Convert to fraction form
    173.56/239.48 = 121.20/x
  3. Step 3: Cross multiply
    173.56x = 239.48 × 121.20
  4. Step 4: Simplify right side
    173.56x = 29,024.98
  5. Step 5: Solve for x
    x = 29,024.98/173.56
  6. Step 6: Final answer
    x = 167.23

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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.