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Finding the Fourth Proportional to 18,754.10, 28,131.19 and 7,660.80

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Solution

The fourth proportional to 18,754.10, 28,131.19 and 7,660.80 is: 11,491.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,754.10 : 28,131.19 = 7,660.80 : x
  2. Step 2: Convert to fraction form
    18,754.10/28,131.19 = 7,660.80/x
  3. Step 3: Cross multiply
    18,754.10x = 28,131.19 × 7,660.80
  4. Step 4: Simplify right side
    18,754.10x = 215,507,429.93
  5. Step 5: Solve for x
    x = 215,507,429.93/18,754.10
  6. Step 6: Final answer
    x = 11,491.22

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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.