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Finding the Fourth Proportional to 672.59, 1,008.93 and 261.73

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Solution

The fourth proportional to 672.59, 1,008.93 and 261.73 is: 392.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.59 : 1,008.93 = 261.73 : x
  2. Step 2: Convert to fraction form
    672.59/1,008.93 = 261.73/x
  3. Step 3: Cross multiply
    672.59x = 1,008.93 × 261.73
  4. Step 4: Simplify right side
    672.59x = 264,067.25
  5. Step 5: Solve for x
    x = 264,067.25/672.59
  6. Step 6: Final answer
    x = 392.61

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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.