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Finding the Fourth Proportional to 641.91, 961.42 and 316.56

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Solution

The fourth proportional to 641.91, 961.42 and 316.56 is: 474.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.91 : 961.42 = 316.56 : x
  2. Step 2: Convert to fraction form
    641.91/961.42 = 316.56/x
  3. Step 3: Cross multiply
    641.91x = 961.42 × 316.56
  4. Step 4: Simplify right side
    641.91x = 304,347.12
  5. Step 5: Solve for x
    x = 304,347.12/641.91
  6. Step 6: Final answer
    x = 474.13

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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.