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Finding the Fourth Proportional to 843.15, 1,265.15 and 638.97

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Solution

The fourth proportional to 843.15, 1,265.15 and 638.97 is: 958.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.15 : 1,265.15 = 638.97 : x
  2. Step 2: Convert to fraction form
    843.15/1,265.15 = 638.97/x
  3. Step 3: Cross multiply
    843.15x = 1,265.15 × 638.97
  4. Step 4: Simplify right side
    843.15x = 808,392.90
  5. Step 5: Solve for x
    x = 808,392.90/843.15
  6. Step 6: Final answer
    x = 958.78

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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.