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Finding the Fourth Proportional to 256.67, 385.05 and 119.75

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Solution

The fourth proportional to 256.67, 385.05 and 119.75 is: 179.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.67 : 385.05 = 119.75 : x
  2. Step 2: Convert to fraction form
    256.67/385.05 = 119.75/x
  3. Step 3: Cross multiply
    256.67x = 385.05 × 119.75
  4. Step 4: Simplify right side
    256.67x = 46,108.26
  5. Step 5: Solve for x
    x = 46,108.26/256.67
  6. Step 6: Final answer
    x = 179.64

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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.