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Finding the Fourth Proportional to 672.26, 1,008.39 and 261.44

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Solution

The fourth proportional to 672.26, 1,008.39 and 261.44 is: 392.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.26 : 1,008.39 = 261.44 : x
  2. Step 2: Convert to fraction form
    672.26/1,008.39 = 261.44/x
  3. Step 3: Cross multiply
    672.26x = 1,008.39 × 261.44
  4. Step 4: Simplify right side
    672.26x = 263,628.53
  5. Step 5: Solve for x
    x = 263,628.53/672.26
  6. Step 6: Final answer
    x = 392.15

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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.