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Finding the Fourth Proportional to 18,756.10, 28,134.19 and 7,662.80

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Solution

The fourth proportional to 18,756.10, 28,134.19 and 7,662.80 is: 11,494.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,756.10 : 28,134.19 = 7,662.80 : x
  2. Step 2: Convert to fraction form
    18,756.10/28,134.19 = 7,662.80/x
  3. Step 3: Cross multiply
    18,756.10x = 28,134.19 × 7,662.80
  4. Step 4: Simplify right side
    18,756.10x = 215,586,671.13
  5. Step 5: Solve for x
    x = 215,586,671.13/18,756.10
  6. Step 6: Final answer
    x = 11,494.22

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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.