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Finding the Fourth Proportional to 641.64, 961.62 and 276.36

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Solution

The fourth proportional to 641.64, 961.62 and 276.36 is: 414.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.64 : 961.62 = 276.36 : x
  2. Step 2: Convert to fraction form
    641.64/961.62 = 276.36/x
  3. Step 3: Cross multiply
    641.64x = 961.62 × 276.36
  4. Step 4: Simplify right side
    641.64x = 265,753.30
  5. Step 5: Solve for x
    x = 265,753.30/641.64
  6. Step 6: Final answer
    x = 414.18

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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.