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Finding the Fourth Proportional to 2,079.20, 3,119.04 and 762.80

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Solution

The fourth proportional to 2,079.20, 3,119.04 and 762.80 is: 1,144.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,079.20 : 3,119.04 = 762.80 : x
  2. Step 2: Convert to fraction form
    2,079.20/3,119.04 = 762.80/x
  3. Step 3: Cross multiply
    2,079.20x = 3,119.04 × 762.80
  4. Step 4: Simplify right side
    2,079.20x = 2,379,203.71
  5. Step 5: Solve for x
    x = 2,379,203.71/2,079.20
  6. Step 6: Final answer
    x = 1,144.29

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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.