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Finding the Fourth Proportional to 822.78, 1,135.51 and 449.81

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Solution

The fourth proportional to 822.78, 1,135.51 and 449.81 is: 620.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.78 : 1,135.51 = 449.81 : x
  2. Step 2: Convert to fraction form
    822.78/1,135.51 = 449.81/x
  3. Step 3: Cross multiply
    822.78x = 1,135.51 × 449.81
  4. Step 4: Simplify right side
    822.78x = 510,763.12
  5. Step 5: Solve for x
    x = 510,763.12/822.78
  6. Step 6: Final answer
    x = 620.78

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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.