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Finding the Fourth Proportional to 3,419.71, 5,129.56 and 2,640.84

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Solution

The fourth proportional to 3,419.71, 5,129.56 and 2,640.84 is: 3,961.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,419.71 : 5,129.56 = 2,640.84 : x
  2. Step 2: Convert to fraction form
    3,419.71/5,129.56 = 2,640.84/x
  3. Step 3: Cross multiply
    3,419.71x = 5,129.56 × 2,640.84
  4. Step 4: Simplify right side
    3,419.71x = 13,546,341.79
  5. Step 5: Solve for x
    x = 13,546,341.79/3,419.71
  6. Step 6: Final answer
    x = 3,961.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.