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Finding the Fourth Proportional to 820.31, 1,131.99 and 447.26

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Solution

The fourth proportional to 820.31, 1,131.99 and 447.26 is: 617.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.31 : 1,131.99 = 447.26 : x
  2. Step 2: Convert to fraction form
    820.31/1,131.99 = 447.26/x
  3. Step 3: Cross multiply
    820.31x = 1,131.99 × 447.26
  4. Step 4: Simplify right side
    820.31x = 506,293.85
  5. Step 5: Solve for x
    x = 506,293.85/820.31
  6. Step 6: Final answer
    x = 617.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.