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Finding the Fourth Proportional to 18,661.20, 27,991.80 and 5,513.70

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Solution

The fourth proportional to 18,661.20, 27,991.80 and 5,513.70 is: 8,270.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,661.20 : 27,991.80 = 5,513.70 : x
  2. Step 2: Convert to fraction form
    18,661.20/27,991.80 = 5,513.70/x
  3. Step 3: Cross multiply
    18,661.20x = 27,991.80 × 5,513.70
  4. Step 4: Simplify right side
    18,661.20x = 154,338,387.66
  5. Step 5: Solve for x
    x = 154,338,387.66/18,661.20
  6. Step 6: Final answer
    x = 8,270.55

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Similar ratio
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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.