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Finding the Fourth Proportional to 172.74, 238.08 and 123.51

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Solution

The fourth proportional to 172.74, 238.08 and 123.51 is: 170.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.74 : 238.08 = 123.51 : x
  2. Step 2: Convert to fraction form
    172.74/238.08 = 123.51/x
  3. Step 3: Cross multiply
    172.74x = 238.08 × 123.51
  4. Step 4: Simplify right side
    172.74x = 29,405.26
  5. Step 5: Solve for x
    x = 29,405.26/172.74
  6. Step 6: Final answer
    x = 170.23

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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.