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Finding the Fourth Proportional to 172.40, 238.01 and 123.53

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Solution

The fourth proportional to 172.40, 238.01 and 123.53 is: 170.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.40 : 238.01 = 123.53 : x
  2. Step 2: Convert to fraction form
    172.40/238.01 = 123.53/x
  3. Step 3: Cross multiply
    172.40x = 238.01 × 123.53
  4. Step 4: Simplify right side
    172.40x = 29,399.57
  5. Step 5: Solve for x
    x = 29,399.57/172.40
  6. Step 6: Final answer
    x = 170.54

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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.