Home / 2,148.36-3,222.41-687.39

Finding the Fourth Proportional to 2,148.36, 3,222.41 and 687.39

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Solution

The fourth proportional to 2,148.36, 3,222.41 and 687.39 is: 1,031.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,148.36 : 3,222.41 = 687.39 : x
  2. Step 2: Convert to fraction form
    2,148.36/3,222.41 = 687.39/x
  3. Step 3: Cross multiply
    2,148.36x = 3,222.41 × 687.39
  4. Step 4: Simplify right side
    2,148.36x = 2,215,048.97
  5. Step 5: Solve for x
    x = 2,215,048.97/2,148.36
  6. Step 6: Final answer
    x = 1,031.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.