Home / 3,783.60-5,221.40-2,105.20

Finding the Fourth Proportional to 3,783.60, 5,221.40 and 2,105.20

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Solution

The fourth proportional to 3,783.60, 5,221.40 and 2,105.20 is: 2,905.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,783.60 : 5,221.40 = 2,105.20 : x
  2. Step 2: Convert to fraction form
    3,783.60/5,221.40 = 2,105.20/x
  3. Step 3: Cross multiply
    3,783.60x = 5,221.40 × 2,105.20
  4. Step 4: Simplify right side
    3,783.60x = 10,992,091.28
  5. Step 5: Solve for x
    x = 10,992,091.28/3,783.60
  6. Step 6: Final answer
    x = 2,905.19

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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.