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Finding the Fourth Proportional to 3,906, 5,388.60 and 2,561.16

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Solution

The fourth proportional to 3,906, 5,388.60 and 2,561.16 is: 3,533.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,906 : 5,388.60 = 2,561.16 : x
  2. Step 2: Convert to fraction form
    3,906/5,388.60 = 2,561.16/x
  3. Step 3: Cross multiply
    3,906x = 5,388.60 × 2,561.16
  4. Step 4: Simplify right side
    3,906x = 13,801,066.78
  5. Step 5: Solve for x
    x = 13,801,066.78/3,906
  6. Step 6: Final answer
    x = 3,533.30

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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.