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Finding the Fourth Proportional to 172.46, 258.39 and 136.55

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Solution

The fourth proportional to 172.46, 258.39 and 136.55 is: 204.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.46 : 258.39 = 136.55 : x
  2. Step 2: Convert to fraction form
    172.46/258.39 = 136.55/x
  3. Step 3: Cross multiply
    172.46x = 258.39 × 136.55
  4. Step 4: Simplify right side
    172.46x = 35,283.80
  5. Step 5: Solve for x
    x = 35,283.80/172.46
  6. Step 6: Final answer
    x = 204.59

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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.