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Finding the Fourth Proportional to 885.20, 1,222.18 and 811.24

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Solution

The fourth proportional to 885.20, 1,222.18 and 811.24 is: 1,120.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.20 : 1,222.18 = 811.24 : x
  2. Step 2: Convert to fraction form
    885.20/1,222.18 = 811.24/x
  3. Step 3: Cross multiply
    885.20x = 1,222.18 × 811.24
  4. Step 4: Simplify right side
    885.20x = 991,481.30
  5. Step 5: Solve for x
    x = 991,481.30/885.20
  6. Step 6: Final answer
    x = 1,120.06

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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.