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Finding the Fourth Proportional to 822.48, 1,134.96 and 491

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Solution

The fourth proportional to 822.48, 1,134.96 and 491 is: 677.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.48 : 1,134.96 = 491 : x
  2. Step 2: Convert to fraction form
    822.48/1,134.96 = 491/x
  3. Step 3: Cross multiply
    822.48x = 1,134.96 × 491
  4. Step 4: Simplify right side
    822.48x = 557,265.36
  5. Step 5: Solve for x
    x = 557,265.36/822.48
  6. Step 6: Final answer
    x = 677.54

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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.