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Finding the Fourth Proportional to 698.85, 1,042.80 and 694.80

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Solution

The fourth proportional to 698.85, 1,042.80 and 694.80 is: 1,036.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.85 : 1,042.80 = 694.80 : x
  2. Step 2: Convert to fraction form
    698.85/1,042.80 = 694.80/x
  3. Step 3: Cross multiply
    698.85x = 1,042.80 × 694.80
  4. Step 4: Simplify right side
    698.85x = 724,537.44
  5. Step 5: Solve for x
    x = 724,537.44/698.85
  6. Step 6: Final answer
    x = 1,036.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.