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Finding the Fourth Proportional to 822.75, 1,234.13 and 309.75

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Solution

The fourth proportional to 822.75, 1,234.13 and 309.75 is: 464.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.75 : 1,234.13 = 309.75 : x
  2. Step 2: Convert to fraction form
    822.75/1,234.13 = 309.75/x
  3. Step 3: Cross multiply
    822.75x = 1,234.13 × 309.75
  4. Step 4: Simplify right side
    822.75x = 382,270.22
  5. Step 5: Solve for x
    x = 382,270.22/822.75
  6. Step 6: Final answer
    x = 464.63

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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.