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Finding the Fourth Proportional to 256.49, 353.89 and 243.71

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Solution

The fourth proportional to 256.49, 353.89 and 243.71 is: 336.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.49 : 353.89 = 243.71 : x
  2. Step 2: Convert to fraction form
    256.49/353.89 = 243.71/x
  3. Step 3: Cross multiply
    256.49x = 353.89 × 243.71
  4. Step 4: Simplify right side
    256.49x = 86,246.53
  5. Step 5: Solve for x
    x = 86,246.53/256.49
  6. Step 6: Final answer
    x = 336.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.