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Finding the Fourth Proportional to 822.35, 1,136.01 and 638.21

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Solution

The fourth proportional to 822.35, 1,136.01 and 638.21 is: 881.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.35 : 1,136.01 = 638.21 : x
  2. Step 2: Convert to fraction form
    822.35/1,136.01 = 638.21/x
  3. Step 3: Cross multiply
    822.35x = 1,136.01 × 638.21
  4. Step 4: Simplify right side
    822.35x = 725,007.26
  5. Step 5: Solve for x
    x = 725,007.26/822.35
  6. Step 6: Final answer
    x = 881.63

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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.