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Finding the Fourth Proportional to 11,906.12, 16,420.20 and 7,425.20

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Solution

The fourth proportional to 11,906.12, 16,420.20 and 7,425.20 is: 10,240.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,906.12 : 16,420.20 = 7,425.20 : x
  2. Step 2: Convert to fraction form
    11,906.12/16,420.20 = 7,425.20/x
  3. Step 3: Cross multiply
    11,906.12x = 16,420.20 × 7,425.20
  4. Step 4: Simplify right side
    11,906.12x = 121,923,269.04
  5. Step 5: Solve for x
    x = 121,923,269.04/11,906.12
  6. Step 6: Final answer
    x = 10,240.39

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Double scale
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1.5x scale

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.