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Finding the Fourth Proportional to 822.24, 1,131.78 and 813.12

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Solution

The fourth proportional to 822.24, 1,131.78 and 813.12 is: 1,119.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.24 : 1,131.78 = 813.12 : x
  2. Step 2: Convert to fraction form
    822.24/1,131.78 = 813.12/x
  3. Step 3: Cross multiply
    822.24x = 1,131.78 × 813.12
  4. Step 4: Simplify right side
    822.24x = 920,272.95
  5. Step 5: Solve for x
    x = 920,272.95/822.24
  6. Step 6: Final answer
    x = 1,119.23

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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.