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Finding the Third Proportional to 455.25 and 721.88

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Solution

The third proportional to 455.25 and 721.88 is: 1,144.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.25 : 721.88 = 721.88 : x
  2. Step 2: Convert to fraction form
    455.25/721.88 = 721.88/x
  3. Step 3: Cross multiply
    455.25x = 721.88 × 721.88
  4. Step 4: Simplify right side
    455.25x = 521,103.52
  5. Step 5: Solve for x
    x = 521,103.52/455.25
  6. Step 6: Final answer
    x = 1,144.65

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.