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Finding the Third Proportional to 256.29 and 400.45

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Solution

The third proportional to 256.29 and 400.45 is: 625.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.29 : 400.45 = 400.45 : x
  2. Step 2: Convert to fraction form
    256.29/400.45 = 400.45/x
  3. Step 3: Cross multiply
    256.29x = 400.45 × 400.45
  4. Step 4: Simplify right side
    256.29x = 160,361.53
  5. Step 5: Solve for x
    x = 160,361.53/256.29
  6. Step 6: Final answer
    x = 625.71

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.