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Finding the Fourth Proportional to 822.98, 1,134.90 and 636.18

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Solution

The fourth proportional to 822.98, 1,134.90 and 636.18 is: 877.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.98 : 1,134.90 = 636.18 : x
  2. Step 2: Convert to fraction form
    822.98/1,134.90 = 636.18/x
  3. Step 3: Cross multiply
    822.98x = 1,134.90 × 636.18
  4. Step 4: Simplify right side
    822.98x = 722,000.68
  5. Step 5: Solve for x
    x = 722,000.68/822.98
  6. Step 6: Final answer
    x = 877.31

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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.