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Finding the Fourth Proportional to 3,183.40, 4,775.10 and 992.80

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Solution

The fourth proportional to 3,183.40, 4,775.10 and 992.80 is: 1,489.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,183.40 : 4,775.10 = 992.80 : x
  2. Step 2: Convert to fraction form
    3,183.40/4,775.10 = 992.80/x
  3. Step 3: Cross multiply
    3,183.40x = 4,775.10 × 992.80
  4. Step 4: Simplify right side
    3,183.40x = 4,740,719.28
  5. Step 5: Solve for x
    x = 4,740,719.28/3,183.40
  6. Step 6: Final answer
    x = 1,489.20

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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.