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Finding the Fourth Proportional to 256.41, 385.12 and 153.88

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Solution

The fourth proportional to 256.41, 385.12 and 153.88 is: 231.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.41 : 385.12 = 153.88 : x
  2. Step 2: Convert to fraction form
    256.41/385.12 = 153.88/x
  3. Step 3: Cross multiply
    256.41x = 385.12 × 153.88
  4. Step 4: Simplify right side
    256.41x = 59,262.27
  5. Step 5: Solve for x
    x = 59,262.27/256.41
  6. Step 6: Final answer
    x = 231.13

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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.