Home / 1,121.30-1,553.95-1,105.64

Finding the Fourth Proportional to 1,121.30, 1,553.95 and 1,105.64

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Solution

The fourth proportional to 1,121.30, 1,553.95 and 1,105.64 is: 1,532.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.30 : 1,553.95 = 1,105.64 : x
  2. Step 2: Convert to fraction form
    1,121.30/1,553.95 = 1,105.64/x
  3. Step 3: Cross multiply
    1,121.30x = 1,553.95 × 1,105.64
  4. Step 4: Simplify right side
    1,121.30x = 1,718,109.28
  5. Step 5: Solve for x
    x = 1,718,109.28/1,121.30
  6. Step 6: Final answer
    x = 1,532.25

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.