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Finding the Fourth Proportional to 256.67, 385.14 and 141.21

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Solution

The fourth proportional to 256.67, 385.14 and 141.21 is: 211.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.67 : 385.14 = 141.21 : x
  2. Step 2: Convert to fraction form
    256.67/385.14 = 141.21/x
  3. Step 3: Cross multiply
    256.67x = 385.14 × 141.21
  4. Step 4: Simplify right side
    256.67x = 54,384.66
  5. Step 5: Solve for x
    x = 54,384.66/256.67
  6. Step 6: Final answer
    x = 211.88

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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.