Home / 3,905.21-5,383.58-2,784.20

Finding the Fourth Proportional to 3,905.21, 5,383.58 and 2,784.20

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Solution

The fourth proportional to 3,905.21, 5,383.58 and 2,784.20 is: 3,838.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,905.21 : 5,383.58 = 2,784.20 : x
  2. Step 2: Convert to fraction form
    3,905.21/5,383.58 = 2,784.20/x
  3. Step 3: Cross multiply
    3,905.21x = 5,383.58 × 2,784.20
  4. Step 4: Simplify right side
    3,905.21x = 14,988,973.41
  5. Step 5: Solve for x
    x = 14,988,973.41/3,905.21
  6. Step 6: Final answer
    x = 3,838.20

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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.