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Finding the Fourth Proportional to 256.62, 354.06 and 212.88

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Solution

The fourth proportional to 256.62, 354.06 and 212.88 is: 293.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.62 : 354.06 = 212.88 : x
  2. Step 2: Convert to fraction form
    256.62/354.06 = 212.88/x
  3. Step 3: Cross multiply
    256.62x = 354.06 × 212.88
  4. Step 4: Simplify right side
    256.62x = 75,372.29
  5. Step 5: Solve for x
    x = 75,372.29/256.62
  6. Step 6: Final answer
    x = 293.71

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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.