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Finding the Fourth Proportional to 672.38, 1,007.97 and 326.05

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Solution

The fourth proportional to 672.38, 1,007.97 and 326.05 is: 488.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.38 : 1,007.97 = 326.05 : x
  2. Step 2: Convert to fraction form
    672.38/1,007.97 = 326.05/x
  3. Step 3: Cross multiply
    672.38x = 1,007.97 × 326.05
  4. Step 4: Simplify right side
    672.38x = 328,648.62
  5. Step 5: Solve for x
    x = 328,648.62/672.38
  6. Step 6: Final answer
    x = 488.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.