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Finding the Fourth Proportional to 3,990.80, 5,986.20 and 2,997.20

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Solution

The fourth proportional to 3,990.80, 5,986.20 and 2,997.20 is: 4,495.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.80 : 5,986.20 = 2,997.20 : x
  2. Step 2: Convert to fraction form
    3,990.80/5,986.20 = 2,997.20/x
  3. Step 3: Cross multiply
    3,990.80x = 5,986.20 × 2,997.20
  4. Step 4: Simplify right side
    3,990.80x = 17,941,838.64
  5. Step 5: Solve for x
    x = 17,941,838.64/3,990.80
  6. Step 6: Final answer
    x = 4,495.80

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Similar ratio
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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.