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Finding the Fourth Proportional to 2,990.80, 4,480.80 and 2,796.40

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Solution

The fourth proportional to 2,990.80, 4,480.80 and 2,796.40 is: 4,189.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.80 : 4,480.80 = 2,796.40 : x
  2. Step 2: Convert to fraction form
    2,990.80/4,480.80 = 2,796.40/x
  3. Step 3: Cross multiply
    2,990.80x = 4,480.80 × 2,796.40
  4. Step 4: Simplify right side
    2,990.80x = 12,530,109.12
  5. Step 5: Solve for x
    x = 12,530,109.12/2,990.80
  6. Step 6: Final answer
    x = 4,189.55

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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.