Home / 2,142.30-3,213.45-1,170.30

Finding the Fourth Proportional to 2,142.30, 3,213.45 and 1,170.30

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Solution

The fourth proportional to 2,142.30, 3,213.45 and 1,170.30 is: 1,755.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,142.30 : 3,213.45 = 1,170.30 : x
  2. Step 2: Convert to fraction form
    2,142.30/3,213.45 = 1,170.30/x
  3. Step 3: Cross multiply
    2,142.30x = 3,213.45 × 1,170.30
  4. Step 4: Simplify right side
    2,142.30x = 3,760,700.54
  5. Step 5: Solve for x
    x = 3,760,700.54/2,142.30
  6. Step 6: Final answer
    x = 1,755.45

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Half 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.