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Finding the Fourth Proportional to 645.15, 966.92 and 279.54

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Solution

The fourth proportional to 645.15, 966.92 and 279.54 is: 418.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.15 : 966.92 = 279.54 : x
  2. Step 2: Convert to fraction form
    645.15/966.92 = 279.54/x
  3. Step 3: Cross multiply
    645.15x = 966.92 × 279.54
  4. Step 4: Simplify right side
    645.15x = 270,292.82
  5. Step 5: Solve for x
    x = 270,292.82/645.15
  6. Step 6: Final answer
    x = 418.96

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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.