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Finding the Fourth Proportional to 173.20, 238.76 and 121.36

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Solution

The fourth proportional to 173.20, 238.76 and 121.36 is: 167.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.20 : 238.76 = 121.36 : x
  2. Step 2: Convert to fraction form
    173.20/238.76 = 121.36/x
  3. Step 3: Cross multiply
    173.20x = 238.76 × 121.36
  4. Step 4: Simplify right side
    173.20x = 28,975.91
  5. Step 5: Solve for x
    x = 28,975.91/173.20
  6. Step 6: Final answer
    x = 167.30

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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.