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Finding the Fourth Proportional to 822.12, 1,131.84 and 718.56

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Solution

The fourth proportional to 822.12, 1,131.84 and 718.56 is: 989.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.12 : 1,131.84 = 718.56 : x
  2. Step 2: Convert to fraction form
    822.12/1,131.84 = 718.56/x
  3. Step 3: Cross multiply
    822.12x = 1,131.84 × 718.56
  4. Step 4: Simplify right side
    822.12x = 813,294.95
  5. Step 5: Solve for x
    x = 813,294.95/822.12
  6. Step 6: Final answer
    x = 989.27

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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.