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Finding the Fourth Proportional to 836.10, 1,151.36 and 717.20

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Solution

The fourth proportional to 836.10, 1,151.36 and 717.20 is: 987.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.10 : 1,151.36 = 717.20 : x
  2. Step 2: Convert to fraction form
    836.10/1,151.36 = 717.20/x
  3. Step 3: Cross multiply
    836.10x = 1,151.36 × 717.20
  4. Step 4: Simplify right side
    836.10x = 825,755.39
  5. Step 5: Solve for x
    x = 825,755.39/836.10
  6. Step 6: Final answer
    x = 987.63

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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.