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Finding the Fourth Proportional to 671.74, 1,007.76 and 398.04

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Solution

The fourth proportional to 671.74, 1,007.76 and 398.04 is: 597.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.74 : 1,007.76 = 398.04 : x
  2. Step 2: Convert to fraction form
    671.74/1,007.76 = 398.04/x
  3. Step 3: Cross multiply
    671.74x = 1,007.76 × 398.04
  4. Step 4: Simplify right side
    671.74x = 401,128.79
  5. Step 5: Solve for x
    x = 401,128.79/671.74
  6. Step 6: Final answer
    x = 597.15

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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.