Home / 3,191.10-4,786.80-999.90

Finding the Fourth Proportional to 3,191.10, 4,786.80 and 999.90

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Solution

The fourth proportional to 3,191.10, 4,786.80 and 999.90 is: 1,499.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,191.10 : 4,786.80 = 999.90 : x
  2. Step 2: Convert to fraction form
    3,191.10/4,786.80 = 999.90/x
  3. Step 3: Cross multiply
    3,191.10x = 4,786.80 × 999.90
  4. Step 4: Simplify right side
    3,191.10x = 4,786,321.32
  5. Step 5: Solve for x
    x = 4,786,321.32/3,191.10
  6. Step 6: Final answer
    x = 1,499.90

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Double scale
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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.