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Finding the Fourth Proportional to 641.76, 961.26 and 435.20

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Solution

The fourth proportional to 641.76, 961.26 and 435.20 is: 651.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.76 : 961.26 = 435.20 : x
  2. Step 2: Convert to fraction form
    641.76/961.26 = 435.20/x
  3. Step 3: Cross multiply
    641.76x = 961.26 × 435.20
  4. Step 4: Simplify right side
    641.76x = 418,335.55
  5. Step 5: Solve for x
    x = 418,335.55/641.76
  6. Step 6: Final answer
    x = 651.86

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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.