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Finding the Fourth Proportional to 2,019.85, 3,030.54 and 979.80

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Solution

The fourth proportional to 2,019.85, 3,030.54 and 979.80 is: 1,470.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,019.85 : 3,030.54 = 979.80 : x
  2. Step 2: Convert to fraction form
    2,019.85/3,030.54 = 979.80/x
  3. Step 3: Cross multiply
    2,019.85x = 3,030.54 × 979.80
  4. Step 4: Simplify right side
    2,019.85x = 2,969,323.09
  5. Step 5: Solve for x
    x = 2,969,323.09/2,019.85
  6. Step 6: Final answer
    x = 1,470.07

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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.