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Finding the Fourth Proportional to 812.82, 1,217.40 and 695.94

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Solution

The fourth proportional to 812.82, 1,217.40 and 695.94 is: 1,042.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.82 : 1,217.40 = 695.94 : x
  2. Step 2: Convert to fraction form
    812.82/1,217.40 = 695.94/x
  3. Step 3: Cross multiply
    812.82x = 1,217.40 × 695.94
  4. Step 4: Simplify right side
    812.82x = 847,237.36
  5. Step 5: Solve for x
    x = 847,237.36/812.82
  6. Step 6: Final answer
    x = 1,042.34

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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.