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Finding the Fourth Proportional to 2,019.80, 3,029.30 and 979.80

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Solution

The fourth proportional to 2,019.80, 3,029.30 and 979.80 is: 1,469.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,019.80 : 3,029.30 = 979.80 : x
  2. Step 2: Convert to fraction form
    2,019.80/3,029.30 = 979.80/x
  3. Step 3: Cross multiply
    2,019.80x = 3,029.30 × 979.80
  4. Step 4: Simplify right side
    2,019.80x = 2,968,108.14
  5. Step 5: Solve for x
    x = 2,968,108.14/2,019.80
  6. Step 6: Final answer
    x = 1,469.51

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1.5x scale

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.