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Finding the Fourth Proportional to 3,900.72, 5,383.58 and 2,221.72

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Solution

The fourth proportional to 3,900.72, 5,383.58 and 2,221.72 is: 3,066.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,900.72 : 5,383.58 = 2,221.72 : x
  2. Step 2: Convert to fraction form
    3,900.72/5,383.58 = 2,221.72/x
  3. Step 3: Cross multiply
    3,900.72x = 5,383.58 × 2,221.72
  4. Step 4: Simplify right side
    3,900.72x = 11,960,807.36
  5. Step 5: Solve for x
    x = 11,960,807.36/3,900.72
  6. Step 6: Final answer
    x = 3,066.31

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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.