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Finding the Fourth Proportional to 800.80, 1,199.76 and 698.40

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Solution

The fourth proportional to 800.80, 1,199.76 and 698.40 is: 1,046.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.80 : 1,199.76 = 698.40 : x
  2. Step 2: Convert to fraction form
    800.80/1,199.76 = 698.40/x
  3. Step 3: Cross multiply
    800.80x = 1,199.76 × 698.40
  4. Step 4: Simplify right side
    800.80x = 837,912.38
  5. Step 5: Solve for x
    x = 837,912.38/800.80
  6. Step 6: Final answer
    x = 1,046.34

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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.