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Finding the Fourth Proportional to 172.46, 258.81 and 81.17

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Solution

The fourth proportional to 172.46, 258.81 and 81.17 is: 121.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.46 : 258.81 = 81.17 : x
  2. Step 2: Convert to fraction form
    172.46/258.81 = 81.17/x
  3. Step 3: Cross multiply
    172.46x = 258.81 × 81.17
  4. Step 4: Simplify right side
    172.46x = 21,005.91
  5. Step 5: Solve for x
    x = 21,005.91/172.46
  6. Step 6: Final answer
    x = 121.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.