Home / 2,139.76-3,208.25-1,407.11

Finding the Fourth Proportional to 2,139.76, 3,208.25 and 1,407.11

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Solution

The fourth proportional to 2,139.76, 3,208.25 and 1,407.11 is: 2,109.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.76 : 3,208.25 = 1,407.11 : x
  2. Step 2: Convert to fraction form
    2,139.76/3,208.25 = 1,407.11/x
  3. Step 3: Cross multiply
    2,139.76x = 3,208.25 × 1,407.11
  4. Step 4: Simplify right side
    2,139.76x = 4,514,360.66
  5. Step 5: Solve for x
    x = 4,514,360.66/2,139.76
  6. Step 6: Final answer
    x = 2,109.75

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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.