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Finding the Fourth Proportional to 672.46, 1,008.39 and 261.36

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Solution

The fourth proportional to 672.46, 1,008.39 and 261.36 is: 391.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.46 : 1,008.39 = 261.36 : x
  2. Step 2: Convert to fraction form
    672.46/1,008.39 = 261.36/x
  3. Step 3: Cross multiply
    672.46x = 1,008.39 × 261.36
  4. Step 4: Simplify right side
    672.46x = 263,553.79
  5. Step 5: Solve for x
    x = 263,553.79/672.46
  6. Step 6: Final answer
    x = 391.93

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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.