Home / 3,181.05-4,771.80-990.09

Finding the Fourth Proportional to 3,181.05, 4,771.80 and 990.09

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Solution

The fourth proportional to 3,181.05, 4,771.80 and 990.09 is: 1,485.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,181.05 : 4,771.80 = 990.09 : x
  2. Step 2: Convert to fraction form
    3,181.05/4,771.80 = 990.09/x
  3. Step 3: Cross multiply
    3,181.05x = 4,771.80 × 990.09
  4. Step 4: Simplify right side
    3,181.05x = 4,724,511.46
  5. Step 5: Solve for x
    x = 4,724,511.46/3,181.05
  6. Step 6: Final answer
    x = 1,485.21

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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.