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Finding the Fourth Proportional to 169.30, 254.40 and 123.90

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Solution

The fourth proportional to 169.30, 254.40 and 123.90 is: 186.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.30 : 254.40 = 123.90 : x
  2. Step 2: Convert to fraction form
    169.30/254.40 = 123.90/x
  3. Step 3: Cross multiply
    169.30x = 254.40 × 123.90
  4. Step 4: Simplify right side
    169.30x = 31,520.16
  5. Step 5: Solve for x
    x = 31,520.16/169.30
  6. Step 6: Final answer
    x = 186.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.