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Finding the Fourth Proportional to 18,879.19, 28,324.42 and 7,786.55

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Solution

The fourth proportional to 18,879.19, 28,324.42 and 7,786.55 is: 11,682.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.19 : 28,324.42 = 7,786.55 : x
  2. Step 2: Convert to fraction form
    18,879.19/28,324.42 = 7,786.55/x
  3. Step 3: Cross multiply
    18,879.19x = 28,324.42 × 7,786.55
  4. Step 4: Simplify right side
    18,879.19x = 220,549,404.57
  5. Step 5: Solve for x
    x = 220,549,404.57/18,879.19
  6. Step 6: Final answer
    x = 11,682.14

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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.