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Finding the Fourth Proportional to 172.66, 238.19 and 123.45

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Solution

The fourth proportional to 172.66, 238.19 and 123.45 is: 170.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.66 : 238.19 = 123.45 : x
  2. Step 2: Convert to fraction form
    172.66/238.19 = 123.45/x
  3. Step 3: Cross multiply
    172.66x = 238.19 × 123.45
  4. Step 4: Simplify right side
    172.66x = 29,404.56
  5. Step 5: Solve for x
    x = 29,404.56/172.66
  6. Step 6: Final answer
    x = 170.30

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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.