Home / 2,109.13-3,168.26-1,287.90

Finding the Fourth Proportional to 2,109.13, 3,168.26 and 1,287.90

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Solution

The fourth proportional to 2,109.13, 3,168.26 and 1,287.90 is: 1,934.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,109.13 : 3,168.26 = 1,287.90 : x
  2. Step 2: Convert to fraction form
    2,109.13/3,168.26 = 1,287.90/x
  3. Step 3: Cross multiply
    2,109.13x = 3,168.26 × 1,287.90
  4. Step 4: Simplify right side
    2,109.13x = 4,080,402.05
  5. Step 5: Solve for x
    x = 4,080,402.05/2,109.13
  6. Step 6: Final answer
    x = 1,934.64

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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.