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Finding the Fourth Proportional to 671.76, 1,007.72 and 329.68

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Solution

The fourth proportional to 671.76, 1,007.72 and 329.68 is: 494.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.76 : 1,007.72 = 329.68 : x
  2. Step 2: Convert to fraction form
    671.76/1,007.72 = 329.68/x
  3. Step 3: Cross multiply
    671.76x = 1,007.72 × 329.68
  4. Step 4: Simplify right side
    671.76x = 332,225.13
  5. Step 5: Solve for x
    x = 332,225.13/671.76
  6. Step 6: Final answer
    x = 494.56

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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.