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Finding the Third Proportional to 387.38 and 645.94

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Solution

The third proportional to 387.38 and 645.94 is: 1,077.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.38 : 645.94 = 645.94 : x
  2. Step 2: Convert to fraction form
    387.38/645.94 = 645.94/x
  3. Step 3: Cross multiply
    387.38x = 645.94 × 645.94
  4. Step 4: Simplify right side
    387.38x = 417,235.25
  5. Step 5: Solve for x
    x = 417,235.25/387.38
  6. Step 6: Final answer
    x = 1,077.08

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Why These Related Problems?

These problems maintain the same ratio (1.67) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.