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Finding the Fourth Proportional to 822.31, 1,231.13 and 547.85

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Solution

The fourth proportional to 822.31, 1,231.13 and 547.85 is: 820.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.31 : 1,231.13 = 547.85 : x
  2. Step 2: Convert to fraction form
    822.31/1,231.13 = 547.85/x
  3. Step 3: Cross multiply
    822.31x = 1,231.13 × 547.85
  4. Step 4: Simplify right side
    822.31x = 674,479.02
  5. Step 5: Solve for x
    x = 674,479.02/822.31
  6. Step 6: Final answer
    x = 820.23

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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.