Home / 3,180.45-4,771.49-989.20

Finding the Fourth Proportional to 3,180.45, 4,771.49 and 989.20

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Solution

The fourth proportional to 3,180.45, 4,771.49 and 989.20 is: 1,484.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,180.45 : 4,771.49 = 989.20 : x
  2. Step 2: Convert to fraction form
    3,180.45/4,771.49 = 989.20/x
  3. Step 3: Cross multiply
    3,180.45x = 4,771.49 × 989.20
  4. Step 4: Simplify right side
    3,180.45x = 4,719,960.38
  5. Step 5: Solve for x
    x = 4,719,960.38/3,180.45
  6. Step 6: Final answer
    x = 1,484.05

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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.