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Finding the Fourth Proportional to 15,171.20, 20,935.94 and 8,456.80

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Solution

The fourth proportional to 15,171.20, 20,935.94 and 8,456.80 is: 11,670.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,171.20 : 20,935.94 = 8,456.80 : x
  2. Step 2: Convert to fraction form
    15,171.20/20,935.94 = 8,456.80/x
  3. Step 3: Cross multiply
    15,171.20x = 20,935.94 × 8,456.80
  4. Step 4: Simplify right side
    15,171.20x = 177,051,057.39
  5. Step 5: Solve for x
    x = 177,051,057.39/15,171.20
  6. Step 6: Final answer
    x = 11,670.21

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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.