Home / 2,311.12-3,189.38-1,640.10

Finding the Fourth Proportional to 2,311.12, 3,189.38 and 1,640.10

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Solution

The fourth proportional to 2,311.12, 3,189.38 and 1,640.10 is: 2,263.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,311.12 : 3,189.38 = 1,640.10 : x
  2. Step 2: Convert to fraction form
    2,311.12/3,189.38 = 1,640.10/x
  3. Step 3: Cross multiply
    2,311.12x = 3,189.38 × 1,640.10
  4. Step 4: Simplify right side
    2,311.12x = 5,230,902.14
  5. Step 5: Solve for x
    x = 5,230,902.14/2,311.12
  6. Step 6: Final answer
    x = 2,263.36

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Half scale
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Double scale
Find fourth proportional to 2,312.12, 3,190.76 and 1,641.10
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.