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Finding the Fourth Proportional to 812.63, 1,217.42 and 401.29

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Solution

The fourth proportional to 812.63, 1,217.42 and 401.29 is: 601.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.63 : 1,217.42 = 401.29 : x
  2. Step 2: Convert to fraction form
    812.63/1,217.42 = 401.29/x
  3. Step 3: Cross multiply
    812.63x = 1,217.42 × 401.29
  4. Step 4: Simplify right side
    812.63x = 488,534.93
  5. Step 5: Solve for x
    x = 488,534.93/812.63
  6. Step 6: Final answer
    x = 601.18

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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.