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Finding the Fourth Proportional to 694.46, 1,042.78 and 663.68

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Solution

The fourth proportional to 694.46, 1,042.78 and 663.68 is: 996.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.46 : 1,042.78 = 663.68 : x
  2. Step 2: Convert to fraction form
    694.46/1,042.78 = 663.68/x
  3. Step 3: Cross multiply
    694.46x = 1,042.78 × 663.68
  4. Step 4: Simplify right side
    694.46x = 692,072.23
  5. Step 5: Solve for x
    x = 692,072.23/694.46
  6. Step 6: Final answer
    x = 996.56

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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.