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Finding the Third Proportional to 256.31 and 344.91

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Solution

The third proportional to 256.31 and 344.91 is: 464.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.31 : 344.91 = 344.91 : x
  2. Step 2: Convert to fraction form
    256.31/344.91 = 344.91/x
  3. Step 3: Cross multiply
    256.31x = 344.91 × 344.91
  4. Step 4: Simplify right side
    256.31x = 118,960.32
  5. Step 5: Solve for x
    x = 118,960.32/256.31
  6. Step 6: Final answer
    x = 464.12

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.