Home / 2,105.21-2,905.22-1,221.28

Finding the Fourth Proportional to 2,105.21, 2,905.22 and 1,221.28

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Solution

The fourth proportional to 2,105.21, 2,905.22 and 1,221.28 is: 1,685.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,105.21 : 2,905.22 = 1,221.28 : x
  2. Step 2: Convert to fraction form
    2,105.21/2,905.22 = 1,221.28/x
  3. Step 3: Cross multiply
    2,105.21x = 2,905.22 × 1,221.28
  4. Step 4: Simplify right side
    2,105.21x = 3,548,087.08
  5. Step 5: Solve for x
    x = 3,548,087.08/2,105.21
  6. Step 6: Final answer
    x = 1,685.38

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Half scale
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Double scale
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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.