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Finding the Fourth Proportional to 11,420.80, 17,131.20 and 7,921.60

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Solution

The fourth proportional to 11,420.80, 17,131.20 and 7,921.60 is: 11,882.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,420.80 : 17,131.20 = 7,921.60 : x
  2. Step 2: Convert to fraction form
    11,420.80/17,131.20 = 7,921.60/x
  3. Step 3: Cross multiply
    11,420.80x = 17,131.20 × 7,921.60
  4. Step 4: Simplify right side
    11,420.80x = 135,706,513.92
  5. Step 5: Solve for x
    x = 135,706,513.92/11,420.80
  6. Step 6: Final answer
    x = 11,882.40

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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.