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Finding the Fourth Proportional to 1,099.76, 1,517.66 and 634

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Solution

The fourth proportional to 1,099.76, 1,517.66 and 634 is: 874.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.76 : 1,517.66 = 634 : x
  2. Step 2: Convert to fraction form
    1,099.76/1,517.66 = 634/x
  3. Step 3: Cross multiply
    1,099.76x = 1,517.66 × 634
  4. Step 4: Simplify right side
    1,099.76x = 962,196.44
  5. Step 5: Solve for x
    x = 962,196.44/1,099.76
  6. Step 6: Final answer
    x = 874.91

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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.