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Finding the Fourth Proportional to 812.06, 1,218.25 and 422.25

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Solution

The fourth proportional to 812.06, 1,218.25 and 422.25 is: 633.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.06 : 1,218.25 = 422.25 : x
  2. Step 2: Convert to fraction form
    812.06/1,218.25 = 422.25/x
  3. Step 3: Cross multiply
    812.06x = 1,218.25 × 422.25
  4. Step 4: Simplify right side
    812.06x = 514,406.06
  5. Step 5: Solve for x
    x = 514,406.06/812.06
  6. Step 6: Final answer
    x = 633.46

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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.