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Finding the Fourth Proportional to 820.92, 1,230.90 and 564.12

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Solution

The fourth proportional to 820.92, 1,230.90 and 564.12 is: 845.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.92 : 1,230.90 = 564.12 : x
  2. Step 2: Convert to fraction form
    820.92/1,230.90 = 564.12/x
  3. Step 3: Cross multiply
    820.92x = 1,230.90 × 564.12
  4. Step 4: Simplify right side
    820.92x = 694,375.31
  5. Step 5: Solve for x
    x = 694,375.31/820.92
  6. Step 6: Final answer
    x = 845.85

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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.