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Finding the Fourth Proportional to 18,919.26, 28,380.53 and 4,879.17

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Solution

The fourth proportional to 18,919.26, 28,380.53 and 4,879.17 is: 7,319.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.26 : 28,380.53 = 4,879.17 : x
  2. Step 2: Convert to fraction form
    18,919.26/28,380.53 = 4,879.17/x
  3. Step 3: Cross multiply
    18,919.26x = 28,380.53 × 4,879.17
  4. Step 4: Simplify right side
    18,919.26x = 138,473,430.56
  5. Step 5: Solve for x
    x = 138,473,430.56/18,919.26
  6. Step 6: Final answer
    x = 7,319.18

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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.