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Finding the Fourth Proportional to 694.56, 1,042 and 688.80

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Solution

The fourth proportional to 694.56, 1,042 and 688.80 is: 1,033.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.56 : 1,042 = 688.80 : x
  2. Step 2: Convert to fraction form
    694.56/1,042 = 688.80/x
  3. Step 3: Cross multiply
    694.56x = 1,042 × 688.80
  4. Step 4: Simplify right side
    694.56x = 717,729.60
  5. Step 5: Solve for x
    x = 717,729.60/694.56
  6. Step 6: Final answer
    x = 1,033.36

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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.