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Finding the Fourth Proportional to 123.12, 170.04 and 121.20

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Solution

The fourth proportional to 123.12, 170.04 and 121.20 is: 167.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.12 : 170.04 = 121.20 : x
  2. Step 2: Convert to fraction form
    123.12/170.04 = 121.20/x
  3. Step 3: Cross multiply
    123.12x = 170.04 × 121.20
  4. Step 4: Simplify right side
    123.12x = 20,608.85
  5. Step 5: Solve for x
    x = 20,608.85/123.12
  6. Step 6: Final answer
    x = 167.39

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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.