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Finding the Fourth Proportional to 3,809, 5,256.42 and 2,153

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Solution

The fourth proportional to 3,809, 5,256.42 and 2,153 is: 2,971.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,809 : 5,256.42 = 2,153 : x
  2. Step 2: Convert to fraction form
    3,809/5,256.42 = 2,153/x
  3. Step 3: Cross multiply
    3,809x = 5,256.42 × 2,153
  4. Step 4: Simplify right side
    3,809x = 11,317,072.26
  5. Step 5: Solve for x
    x = 11,317,072.26/3,809
  6. Step 6: Final answer
    x = 2,971.14

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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.