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Finding the Fourth Proportional to 822.39, 1,135.13 and 491.04

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Solution

The fourth proportional to 822.39, 1,135.13 and 491.04 is: 677.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.39 : 1,135.13 = 491.04 : x
  2. Step 2: Convert to fraction form
    822.39/1,135.13 = 491.04/x
  3. Step 3: Cross multiply
    822.39x = 1,135.13 × 491.04
  4. Step 4: Simplify right side
    822.39x = 557,391.78
  5. Step 5: Solve for x
    x = 557,391.78/822.39
  6. Step 6: Final answer
    x = 677.77

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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.