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Finding the Fourth Proportional to 671.97, 1,008.21 and 261.39

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Solution

The fourth proportional to 671.97, 1,008.21 and 261.39 is: 392.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.97 : 1,008.21 = 261.39 : x
  2. Step 2: Convert to fraction form
    671.97/1,008.21 = 261.39/x
  3. Step 3: Cross multiply
    671.97x = 1,008.21 × 261.39
  4. Step 4: Simplify right side
    671.97x = 263,535.36
  5. Step 5: Solve for x
    x = 263,535.36/671.97
  6. Step 6: Final answer
    x = 392.19

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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.