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Finding the Fourth Proportional to 1,099.26, 1,517.22 and 657

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Solution

The fourth proportional to 1,099.26, 1,517.22 and 657 is: 906.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.26 : 1,517.22 = 657 : x
  2. Step 2: Convert to fraction form
    1,099.26/1,517.22 = 657/x
  3. Step 3: Cross multiply
    1,099.26x = 1,517.22 × 657
  4. Step 4: Simplify right side
    1,099.26x = 996,813.54
  5. Step 5: Solve for x
    x = 996,813.54/1,099.26
  6. Step 6: Final answer
    x = 906.80

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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.