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Finding the Fourth Proportional to 185.55, 255.96 and 123.42

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Solution

The fourth proportional to 185.55, 255.96 and 123.42 is: 170.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.55 : 255.96 = 123.42 : x
  2. Step 2: Convert to fraction form
    185.55/255.96 = 123.42/x
  3. Step 3: Cross multiply
    185.55x = 255.96 × 123.42
  4. Step 4: Simplify right side
    185.55x = 31,590.58
  5. Step 5: Solve for x
    x = 31,590.58/185.55
  6. Step 6: Final answer
    x = 170.25

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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.