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Finding the Fourth Proportional to 487.75, 672.88 and 326.11

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Solution

The fourth proportional to 487.75, 672.88 and 326.11 is: 449.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.75 : 672.88 = 326.11 : x
  2. Step 2: Convert to fraction form
    487.75/672.88 = 326.11/x
  3. Step 3: Cross multiply
    487.75x = 672.88 × 326.11
  4. Step 4: Simplify right side
    487.75x = 219,432.90
  5. Step 5: Solve for x
    x = 219,432.90/487.75
  6. Step 6: Final answer
    x = 449.89

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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.