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Finding the Fourth Proportional to 671.25, 1,005.49 and 396.67

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Solution

The fourth proportional to 671.25, 1,005.49 and 396.67 is: 594.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.25 : 1,005.49 = 396.67 : x
  2. Step 2: Convert to fraction form
    671.25/1,005.49 = 396.67/x
  3. Step 3: Cross multiply
    671.25x = 1,005.49 × 396.67
  4. Step 4: Simplify right side
    671.25x = 398,849.30
  5. Step 5: Solve for x
    x = 398,849.30/671.25
  6. Step 6: Final answer
    x = 594.19

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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.