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Finding the Fourth Proportional to 11,747.20, 17,620.80 and 5,915.20

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Solution

The fourth proportional to 11,747.20, 17,620.80 and 5,915.20 is: 8,872.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,747.20 : 17,620.80 = 5,915.20 : x
  2. Step 2: Convert to fraction form
    11,747.20/17,620.80 = 5,915.20/x
  3. Step 3: Cross multiply
    11,747.20x = 17,620.80 × 5,915.20
  4. Step 4: Simplify right side
    11,747.20x = 104,230,556.16
  5. Step 5: Solve for x
    x = 104,230,556.16/11,747.20
  6. Step 6: Final answer
    x = 8,872.80

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1.5x scale

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.