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Finding the Fourth Proportional to 15,099.20, 20,837.09 and 8,385.25

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Solution

The fourth proportional to 15,099.20, 20,837.09 and 8,385.25 is: 11,571.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,099.20 : 20,837.09 = 8,385.25 : x
  2. Step 2: Convert to fraction form
    15,099.20/20,837.09 = 8,385.25/x
  3. Step 3: Cross multiply
    15,099.20x = 20,837.09 × 8,385.25
  4. Step 4: Simplify right side
    15,099.20x = 174,724,208.92
  5. Step 5: Solve for x
    x = 174,724,208.92/15,099.20
  6. Step 6: Final answer
    x = 11,571.75

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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.