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Finding the Fourth Proportional to 812.06, 1,218.31 and 292.18

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Solution

The fourth proportional to 812.06, 1,218.31 and 292.18 is: 438.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.06 : 1,218.31 = 292.18 : x
  2. Step 2: Convert to fraction form
    812.06/1,218.31 = 292.18/x
  3. Step 3: Cross multiply
    812.06x = 1,218.31 × 292.18
  4. Step 4: Simplify right side
    812.06x = 355,962.04
  5. Step 5: Solve for x
    x = 355,962.04/812.06
  6. Step 6: Final answer
    x = 438.34

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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.