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Finding the Fourth Proportional to 15,122.97, 20,867.41 and 8,661.60

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Solution

The fourth proportional to 15,122.97, 20,867.41 and 8,661.60 is: 11,951.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,122.97 : 20,867.41 = 8,661.60 : x
  2. Step 2: Convert to fraction form
    15,122.97/20,867.41 = 8,661.60/x
  3. Step 3: Cross multiply
    15,122.97x = 20,867.41 × 8,661.60
  4. Step 4: Simplify right side
    15,122.97x = 180,745,010.81
  5. Step 5: Solve for x
    x = 180,745,010.81/15,122.97
  6. Step 6: Final answer
    x = 11,951.69

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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.