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Finding the Third Proportional to 278.75 and 456.38

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Solution

The third proportional to 278.75 and 456.38 is: 747.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.75 : 456.38 = 456.38 : x
  2. Step 2: Convert to fraction form
    278.75/456.38 = 456.38/x
  3. Step 3: Cross multiply
    278.75x = 456.38 × 456.38
  4. Step 4: Simplify right side
    278.75x = 208,278.14
  5. Step 5: Solve for x
    x = 208,278.14/278.75
  6. Step 6: Final answer
    x = 747.19

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.