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Finding the Fourth Proportional to 185.57, 256 and 123.43

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Solution

The fourth proportional to 185.57, 256 and 123.43 is: 170.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.57 : 256 = 123.43 : x
  2. Step 2: Convert to fraction form
    185.57/256 = 123.43/x
  3. Step 3: Cross multiply
    185.57x = 256 × 123.43
  4. Step 4: Simplify right side
    185.57x = 31,598.08
  5. Step 5: Solve for x
    x = 31,598.08/185.57
  6. Step 6: Final answer
    x = 170.28

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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.