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Finding the Fourth Proportional to 3,990.57, 5,985.87 and 3,984.80

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Solution

The fourth proportional to 3,990.57, 5,985.87 and 3,984.80 is: 5,977.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.57 : 5,985.87 = 3,984.80 : x
  2. Step 2: Convert to fraction form
    3,990.57/5,985.87 = 3,984.80/x
  3. Step 3: Cross multiply
    3,990.57x = 5,985.87 × 3,984.80
  4. Step 4: Simplify right side
    3,990.57x = 23,852,500.94
  5. Step 5: Solve for x
    x = 23,852,500.94/3,990.57
  6. Step 6: Final answer
    x = 5,977.22

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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.