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Finding the Fourth Proportional to 822.28, 1,226.87 and 764.20

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Solution

The fourth proportional to 822.28, 1,226.87 and 764.20 is: 1,140.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.28 : 1,226.87 = 764.20 : x
  2. Step 2: Convert to fraction form
    822.28/1,226.87 = 764.20/x
  3. Step 3: Cross multiply
    822.28x = 1,226.87 × 764.20
  4. Step 4: Simplify right side
    822.28x = 937,574.05
  5. Step 5: Solve for x
    x = 937,574.05/822.28
  6. Step 6: Final answer
    x = 1,140.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.