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Finding the Fourth Proportional to 817.83, 1,229.22 and 531.09

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Solution

The fourth proportional to 817.83, 1,229.22 and 531.09 is: 798.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.83 : 1,229.22 = 531.09 : x
  2. Step 2: Convert to fraction form
    817.83/1,229.22 = 531.09/x
  3. Step 3: Cross multiply
    817.83x = 1,229.22 × 531.09
  4. Step 4: Simplify right side
    817.83x = 652,826.45
  5. Step 5: Solve for x
    x = 652,826.45/817.83
  6. Step 6: Final answer
    x = 798.24

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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.