Home / 1,121.09-1,690.61-1,105.71

Finding the Fourth Proportional to 1,121.09, 1,690.61 and 1,105.71

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Solution

The fourth proportional to 1,121.09, 1,690.61 and 1,105.71 is: 1,667.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.09 : 1,690.61 = 1,105.71 : x
  2. Step 2: Convert to fraction form
    1,121.09/1,690.61 = 1,105.71/x
  3. Step 3: Cross multiply
    1,121.09x = 1,690.61 × 1,105.71
  4. Step 4: Simplify right side
    1,121.09x = 1,869,324.38
  5. Step 5: Solve for x
    x = 1,869,324.38/1,121.09
  6. Step 6: Final answer
    x = 1,667.42

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.