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Finding the Third Proportional to 281.38 and 428.69

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Solution

The third proportional to 281.38 and 428.69 is: 653.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.38 : 428.69 = 428.69 : x
  2. Step 2: Convert to fraction form
    281.38/428.69 = 428.69/x
  3. Step 3: Cross multiply
    281.38x = 428.69 × 428.69
  4. Step 4: Simplify right side
    281.38x = 183,772.97
  5. Step 5: Solve for x
    x = 183,772.97/281.38
  6. Step 6: Final answer
    x = 653.12

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.