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Finding the Fourth Proportional to 672.58, 1,008.61 and 261.66

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Solution

The fourth proportional to 672.58, 1,008.61 and 261.66 is: 392.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.58 : 1,008.61 = 261.66 : x
  2. Step 2: Convert to fraction form
    672.58/1,008.61 = 261.66/x
  3. Step 3: Cross multiply
    672.58x = 1,008.61 × 261.66
  4. Step 4: Simplify right side
    672.58x = 263,912.89
  5. Step 5: Solve for x
    x = 263,912.89/672.58
  6. Step 6: Final answer
    x = 392.39

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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.