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Finding the Fourth Proportional to 172.87, 238.70 and 135.97

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Solution

The fourth proportional to 172.87, 238.70 and 135.97 is: 187.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.87 : 238.70 = 135.97 : x
  2. Step 2: Convert to fraction form
    172.87/238.70 = 135.97/x
  3. Step 3: Cross multiply
    172.87x = 238.70 × 135.97
  4. Step 4: Simplify right side
    172.87x = 32,456.04
  5. Step 5: Solve for x
    x = 32,456.04/172.87
  6. Step 6: Final answer
    x = 187.75

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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.