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Finding the Fourth Proportional to 172.89, 238.45 and 123.75

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Solution

The fourth proportional to 172.89, 238.45 and 123.75 is: 170.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.89 : 238.45 = 123.75 : x
  2. Step 2: Convert to fraction form
    172.89/238.45 = 123.75/x
  3. Step 3: Cross multiply
    172.89x = 238.45 × 123.75
  4. Step 4: Simplify right side
    172.89x = 29,508.19
  5. Step 5: Solve for x
    x = 29,508.19/172.89
  6. Step 6: Final answer
    x = 170.68

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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.