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Finding the Fourth Proportional to 812.44, 1,214.70 and 698.20

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Solution

The fourth proportional to 812.44, 1,214.70 and 698.20 is: 1,043.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.44 : 1,214.70 = 698.20 : x
  2. Step 2: Convert to fraction form
    812.44/1,214.70 = 698.20/x
  3. Step 3: Cross multiply
    812.44x = 1,214.70 × 698.20
  4. Step 4: Simplify right side
    812.44x = 848,103.54
  5. Step 5: Solve for x
    x = 848,103.54/812.44
  6. Step 6: Final answer
    x = 1,043.90

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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.