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Finding the Fourth Proportional to 812.11, 1,218.16 and 292.02

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Solution

The fourth proportional to 812.11, 1,218.16 and 292.02 is: 438.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.11 : 1,218.16 = 292.02 : x
  2. Step 2: Convert to fraction form
    812.11/1,218.16 = 292.02/x
  3. Step 3: Cross multiply
    812.11x = 1,218.16 × 292.02
  4. Step 4: Simplify right side
    812.11x = 355,727.08
  5. Step 5: Solve for x
    x = 355,727.08/812.11
  6. Step 6: Final answer
    x = 438.03

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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.