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Finding the Fourth Proportional to 641.21, 961.91 and 316.60

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Solution

The fourth proportional to 641.21, 961.91 and 316.60 is: 474.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.21 : 961.91 = 316.60 : x
  2. Step 2: Convert to fraction form
    641.21/961.91 = 316.60/x
  3. Step 3: Cross multiply
    641.21x = 961.91 × 316.60
  4. Step 4: Simplify right side
    641.21x = 304,540.71
  5. Step 5: Solve for x
    x = 304,540.71/641.21
  6. Step 6: Final answer
    x = 474.95

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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.