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Finding the Fourth Proportional to 1,099.80, 1,639.99 and 1,089.92

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Solution

The fourth proportional to 1,099.80, 1,639.99 and 1,089.92 is: 1,625.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.80 : 1,639.99 = 1,089.92 : x
  2. Step 2: Convert to fraction form
    1,099.80/1,639.99 = 1,089.92/x
  3. Step 3: Cross multiply
    1,099.80x = 1,639.99 × 1,089.92
  4. Step 4: Simplify right side
    1,099.80x = 1,787,457.90
  5. Step 5: Solve for x
    x = 1,787,457.90/1,099.80
  6. Step 6: Final answer
    x = 1,625.26

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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.