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Finding the Fourth Proportional to 185.43, 255.73 and 123.21

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Solution

The fourth proportional to 185.43, 255.73 and 123.21 is: 169.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.43 : 255.73 = 123.21 : x
  2. Step 2: Convert to fraction form
    185.43/255.73 = 123.21/x
  3. Step 3: Cross multiply
    185.43x = 255.73 × 123.21
  4. Step 4: Simplify right side
    185.43x = 31,506.60
  5. Step 5: Solve for x
    x = 31,506.60/185.43
  6. Step 6: Final answer
    x = 169.92

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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.