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Finding the Fourth Proportional to 256.67, 385.16 and 119.78

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Solution

The fourth proportional to 256.67, 385.16 and 119.78 is: 179.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.67 : 385.16 = 119.78 : x
  2. Step 2: Convert to fraction form
    256.67/385.16 = 119.78/x
  3. Step 3: Cross multiply
    256.67x = 385.16 × 119.78
  4. Step 4: Simplify right side
    256.67x = 46,133.38
  5. Step 5: Solve for x
    x = 46,133.38/256.67
  6. Step 6: Final answer
    x = 179.74

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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.