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Finding the Fourth Proportional to 11,751.20, 17,627.60 and 3,431.20

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Solution

The fourth proportional to 11,751.20, 17,627.60 and 3,431.20 is: 5,147.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,751.20 : 17,627.60 = 3,431.20 : x
  2. Step 2: Convert to fraction form
    11,751.20/17,627.60 = 3,431.20/x
  3. Step 3: Cross multiply
    11,751.20x = 17,627.60 × 3,431.20
  4. Step 4: Simplify right side
    11,751.20x = 60,483,821.12
  5. Step 5: Solve for x
    x = 60,483,821.12/11,751.20
  6. Step 6: Final answer
    x = 5,147.03

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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.