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Finding the Fourth Proportional to 2,079.85, 3,118.33 and 780.97

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Solution

The fourth proportional to 2,079.85, 3,118.33 and 780.97 is: 1,170.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,079.85 : 3,118.33 = 780.97 : x
  2. Step 2: Convert to fraction form
    2,079.85/3,118.33 = 780.97/x
  3. Step 3: Cross multiply
    2,079.85x = 3,118.33 × 780.97
  4. Step 4: Simplify right side
    2,079.85x = 2,435,322.18
  5. Step 5: Solve for x
    x = 2,435,322.18/2,079.85
  6. Step 6: Final answer
    x = 1,170.91

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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.