Home / 2,139.89-3,208.01-1,272.38

Finding the Fourth Proportional to 2,139.89, 3,208.01 and 1,272.38

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Solution

The fourth proportional to 2,139.89, 3,208.01 and 1,272.38 is: 1,907.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.89 : 3,208.01 = 1,272.38 : x
  2. Step 2: Convert to fraction form
    2,139.89/3,208.01 = 1,272.38/x
  3. Step 3: Cross multiply
    2,139.89x = 3,208.01 × 1,272.38
  4. Step 4: Simplify right side
    2,139.89x = 4,081,785.36
  5. Step 5: Solve for x
    x = 4,081,785.36/2,139.89
  6. Step 6: Final answer
    x = 1,907.48

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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.