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Finding the Fourth Proportional to 1,099.20, 1,638.20 and 1,097.49

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Solution

The fourth proportional to 1,099.20, 1,638.20 and 1,097.49 is: 1,635.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.20 : 1,638.20 = 1,097.49 : x
  2. Step 2: Convert to fraction form
    1,099.20/1,638.20 = 1,097.49/x
  3. Step 3: Cross multiply
    1,099.20x = 1,638.20 × 1,097.49
  4. Step 4: Simplify right side
    1,099.20x = 1,797,908.12
  5. Step 5: Solve for x
    x = 1,797,908.12/1,099.20
  6. Step 6: Final answer
    x = 1,635.65

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.