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Finding the Fourth Proportional to 256.29, 353.29 and 211.49

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Solution

The fourth proportional to 256.29, 353.29 and 211.49 is: 291.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.29 : 353.29 = 211.49 : x
  2. Step 2: Convert to fraction form
    256.29/353.29 = 211.49/x
  3. Step 3: Cross multiply
    256.29x = 353.29 × 211.49
  4. Step 4: Simplify right side
    256.29x = 74,717.30
  5. Step 5: Solve for x
    x = 74,717.30/256.29
  6. Step 6: Final answer
    x = 291.53

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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.