Home / 2,079.37-3,120.14-781.75

Finding the Fourth Proportional to 2,079.37, 3,120.14 and 781.75

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Solution

The fourth proportional to 2,079.37, 3,120.14 and 781.75 is: 1,173.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,079.37 : 3,120.14 = 781.75 : x
  2. Step 2: Convert to fraction form
    2,079.37/3,120.14 = 781.75/x
  3. Step 3: Cross multiply
    2,079.37x = 3,120.14 × 781.75
  4. Step 4: Simplify right side
    2,079.37x = 2,439,169.45
  5. Step 5: Solve for x
    x = 2,439,169.45/2,079.37
  6. Step 6: Final answer
    x = 1,173.03

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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.