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Finding the Third Proportional to 330.38 and 388.88

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Solution

The third proportional to 330.38 and 388.88 is: 457.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.38 : 388.88 = 388.88 : x
  2. Step 2: Convert to fraction form
    330.38/388.88 = 388.88/x
  3. Step 3: Cross multiply
    330.38x = 388.88 × 388.88
  4. Step 4: Simplify right side
    330.38x = 151,223.77
  5. Step 5: Solve for x
    x = 151,223.77/330.38
  6. Step 6: Final answer
    x = 457.73

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.