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Finding the Fourth Proportional to 172.78, 258.75 and 95.56

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Solution

The fourth proportional to 172.78, 258.75 and 95.56 is: 143.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.78 : 258.75 = 95.56 : x
  2. Step 2: Convert to fraction form
    172.78/258.75 = 95.56/x
  3. Step 3: Cross multiply
    172.78x = 258.75 × 95.56
  4. Step 4: Simplify right side
    172.78x = 24,725.50
  5. Step 5: Solve for x
    x = 24,725.50/172.78
  6. Step 6: Final answer
    x = 143.11

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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.