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Finding the Fourth Proportional to 822.10, 1,233.15 and 786.55

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Solution

The fourth proportional to 822.10, 1,233.15 and 786.55 is: 1,179.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.10 : 1,233.15 = 786.55 : x
  2. Step 2: Convert to fraction form
    822.10/1,233.15 = 786.55/x
  3. Step 3: Cross multiply
    822.10x = 1,233.15 × 786.55
  4. Step 4: Simplify right side
    822.10x = 969,934.13
  5. Step 5: Solve for x
    x = 969,934.13/822.10
  6. Step 6: Final answer
    x = 1,179.83

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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.