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Finding the Fourth Proportional to 821.67, 1,136.09 and 717.92

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Solution

The fourth proportional to 821.67, 1,136.09 and 717.92 is: 992.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.67 : 1,136.09 = 717.92 : x
  2. Step 2: Convert to fraction form
    821.67/1,136.09 = 717.92/x
  3. Step 3: Cross multiply
    821.67x = 1,136.09 × 717.92
  4. Step 4: Simplify right side
    821.67x = 815,612.46
  5. Step 5: Solve for x
    x = 815,612.46/821.67
  6. Step 6: Final answer
    x = 992.63

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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.