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Finding the Fourth Proportional to 18,660.80, 27,991.68 and 6,180.80

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Solution

The fourth proportional to 18,660.80, 27,991.68 and 6,180.80 is: 9,271.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,660.80 : 27,991.68 = 6,180.80 : x
  2. Step 2: Convert to fraction form
    18,660.80/27,991.68 = 6,180.80/x
  3. Step 3: Cross multiply
    18,660.80x = 27,991.68 × 6,180.80
  4. Step 4: Simplify right side
    18,660.80x = 173,010,975.74
  5. Step 5: Solve for x
    x = 173,010,975.74/18,660.80
  6. Step 6: Final answer
    x = 9,271.36

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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.