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Finding the Fourth Proportional to 672.73, 1,009.21 and 239.78

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Solution

The fourth proportional to 672.73, 1,009.21 and 239.78 is: 359.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.73 : 1,009.21 = 239.78 : x
  2. Step 2: Convert to fraction form
    672.73/1,009.21 = 239.78/x
  3. Step 3: Cross multiply
    672.73x = 1,009.21 × 239.78
  4. Step 4: Simplify right side
    672.73x = 241,988.37
  5. Step 5: Solve for x
    x = 241,988.37/672.73
  6. Step 6: Final answer
    x = 359.71

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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.