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Finding the Fourth Proportional to 816.11, 1,224.67 and 353.89

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Solution

The fourth proportional to 816.11, 1,224.67 and 353.89 is: 531.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.11 : 1,224.67 = 353.89 : x
  2. Step 2: Convert to fraction form
    816.11/1,224.67 = 353.89/x
  3. Step 3: Cross multiply
    816.11x = 1,224.67 × 353.89
  4. Step 4: Simplify right side
    816.11x = 433,398.47
  5. Step 5: Solve for x
    x = 433,398.47/816.11
  6. Step 6: Final answer
    x = 531.05

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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.