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Finding the Fourth Proportional to 256.38, 384.75 and 140.91

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Solution

The fourth proportional to 256.38, 384.75 and 140.91 is: 211.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.38 : 384.75 = 140.91 : x
  2. Step 2: Convert to fraction form
    256.38/384.75 = 140.91/x
  3. Step 3: Cross multiply
    256.38x = 384.75 × 140.91
  4. Step 4: Simplify right side
    256.38x = 54,215.12
  5. Step 5: Solve for x
    x = 54,215.12/256.38
  6. Step 6: Final answer
    x = 211.46

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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.