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Finding the Fourth Proportional to 812.22, 1,218.41 and 292.15

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Solution

The fourth proportional to 812.22, 1,218.41 and 292.15 is: 438.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.22 : 1,218.41 = 292.15 : x
  2. Step 2: Convert to fraction form
    812.22/1,218.41 = 292.15/x
  3. Step 3: Cross multiply
    812.22x = 1,218.41 × 292.15
  4. Step 4: Simplify right side
    812.22x = 355,959.21
  5. Step 5: Solve for x
    x = 355,959.21/812.22
  6. Step 6: Final answer
    x = 438.26

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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.