Home / 3,181.21-4,772.27-990.16

Finding the Fourth Proportional to 3,181.21, 4,772.27 and 990.16

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Solution

The fourth proportional to 3,181.21, 4,772.27 and 990.16 is: 1,485.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,181.21 : 4,772.27 = 990.16 : x
  2. Step 2: Convert to fraction form
    3,181.21/4,772.27 = 990.16/x
  3. Step 3: Cross multiply
    3,181.21x = 4,772.27 × 990.16
  4. Step 4: Simplify right side
    3,181.21x = 4,725,310.86
  5. Step 5: Solve for x
    x = 4,725,310.86/3,181.21
  6. Step 6: Final answer
    x = 1,485.38

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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.