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Finding the Fourth Proportional to 672.20, 1,007.42 and 398.44

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Solution

The fourth proportional to 672.20, 1,007.42 and 398.44 is: 597.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.20 : 1,007.42 = 398.44 : x
  2. Step 2: Convert to fraction form
    672.20/1,007.42 = 398.44/x
  3. Step 3: Cross multiply
    672.20x = 1,007.42 × 398.44
  4. Step 4: Simplify right side
    672.20x = 401,396.42
  5. Step 5: Solve for x
    x = 401,396.42/672.20
  6. Step 6: Final answer
    x = 597.14

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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.