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Finding the Fourth Proportional to 487.31, 672.17 and 321.66

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Solution

The fourth proportional to 487.31, 672.17 and 321.66 is: 443.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.31 : 672.17 = 321.66 : x
  2. Step 2: Convert to fraction form
    487.31/672.17 = 321.66/x
  3. Step 3: Cross multiply
    487.31x = 672.17 × 321.66
  4. Step 4: Simplify right side
    487.31x = 216,208.59
  5. Step 5: Solve for x
    x = 216,208.59/487.31
  6. Step 6: Final answer
    x = 443.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.