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Finding the Fourth Proportional to 172.60, 238.42 and 123.36

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Solution

The fourth proportional to 172.60, 238.42 and 123.36 is: 170.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.60 : 238.42 = 123.36 : x
  2. Step 2: Convert to fraction form
    172.60/238.42 = 123.36/x
  3. Step 3: Cross multiply
    172.60x = 238.42 × 123.36
  4. Step 4: Simplify right side
    172.60x = 29,411.49
  5. Step 5: Solve for x
    x = 29,411.49/172.60
  6. Step 6: Final answer
    x = 170.40

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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.