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Finding the Fourth Proportional to 185.68, 256.20 and 102.78

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Solution

The fourth proportional to 185.68, 256.20 and 102.78 is: 141.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.68 : 256.20 = 102.78 : x
  2. Step 2: Convert to fraction form
    185.68/256.20 = 102.78/x
  3. Step 3: Cross multiply
    185.68x = 256.20 × 102.78
  4. Step 4: Simplify right side
    185.68x = 26,332.24
  5. Step 5: Solve for x
    x = 26,332.24/185.68
  6. Step 6: Final answer
    x = 141.82

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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.