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Finding the Fourth Proportional to 3,990.24, 5,982.12 and 1,392.84

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Solution

The fourth proportional to 3,990.24, 5,982.12 and 1,392.84 is: 2,088.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.24 : 5,982.12 = 1,392.84 : x
  2. Step 2: Convert to fraction form
    3,990.24/5,982.12 = 1,392.84/x
  3. Step 3: Cross multiply
    3,990.24x = 5,982.12 × 1,392.84
  4. Step 4: Simplify right side
    3,990.24x = 8,332,136.02
  5. Step 5: Solve for x
    x = 8,332,136.02/3,990.24
  6. Step 6: Final answer
    x = 2,088.13

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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.