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Finding the Fourth Proportional to 3,921.77, 5,415.03 and 2,662.20

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Solution

The fourth proportional to 3,921.77, 5,415.03 and 2,662.20 is: 3,675.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.77 : 5,415.03 = 2,662.20 : x
  2. Step 2: Convert to fraction form
    3,921.77/5,415.03 = 2,662.20/x
  3. Step 3: Cross multiply
    3,921.77x = 5,415.03 × 2,662.20
  4. Step 4: Simplify right side
    3,921.77x = 14,415,892.87
  5. Step 5: Solve for x
    x = 14,415,892.87/3,921.77
  6. Step 6: Final answer
    x = 3,675.86

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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.