Home / 1,285-1,918.10-1,103.56

Finding the Fourth Proportional to 1,285, 1,918.10 and 1,103.56

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Solution

The fourth proportional to 1,285, 1,918.10 and 1,103.56 is: 1,647.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285 : 1,918.10 = 1,103.56 : x
  2. Step 2: Convert to fraction form
    1,285/1,918.10 = 1,103.56/x
  3. Step 3: Cross multiply
    1,285x = 1,918.10 × 1,103.56
  4. Step 4: Simplify right side
    1,285x = 2,116,738.44
  5. Step 5: Solve for x
    x = 2,116,738.44/1,285
  6. Step 6: Final answer
    x = 1,647.27

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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.