Home / 2,190.20-3,285.30-1,218.20

Finding the Fourth Proportional to 2,190.20, 3,285.30 and 1,218.20

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Solution

The fourth proportional to 2,190.20, 3,285.30 and 1,218.20 is: 1,827.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,190.20 : 3,285.30 = 1,218.20 : x
  2. Step 2: Convert to fraction form
    2,190.20/3,285.30 = 1,218.20/x
  3. Step 3: Cross multiply
    2,190.20x = 3,285.30 × 1,218.20
  4. Step 4: Simplify right side
    2,190.20x = 4,002,152.46
  5. Step 5: Solve for x
    x = 4,002,152.46/2,190.20
  6. Step 6: Final answer
    x = 1,827.30

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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.