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Finding the Fourth Proportional to 256.74, 385.20 and 119.79

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Solution

The fourth proportional to 256.74, 385.20 and 119.79 is: 179.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.74 : 385.20 = 119.79 : x
  2. Step 2: Convert to fraction form
    256.74/385.20 = 119.79/x
  3. Step 3: Cross multiply
    256.74x = 385.20 × 119.79
  4. Step 4: Simplify right side
    256.74x = 46,143.11
  5. Step 5: Solve for x
    x = 46,143.11/256.74
  6. Step 6: Final answer
    x = 179.73

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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.