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Finding the Fourth Proportional to 641.12, 961.67 and 435.18

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Solution

The fourth proportional to 641.12, 961.67 and 435.18 is: 652.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.12 : 961.67 = 435.18 : x
  2. Step 2: Convert to fraction form
    641.12/961.67 = 435.18/x
  3. Step 3: Cross multiply
    641.12x = 961.67 × 435.18
  4. Step 4: Simplify right side
    641.12x = 418,497.37
  5. Step 5: Solve for x
    x = 418,497.37/641.12
  6. Step 6: Final answer
    x = 652.76

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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.