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Finding the Fourth Proportional to 18,879.22, 28,301.14 and 6,390.51

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Solution

The fourth proportional to 18,879.22, 28,301.14 and 6,390.51 is: 9,579.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,879.22 : 28,301.14 = 6,390.51 : x
  2. Step 2: Convert to fraction form
    18,879.22/28,301.14 = 6,390.51/x
  3. Step 3: Cross multiply
    18,879.22x = 28,301.14 × 6,390.51
  4. Step 4: Simplify right side
    18,879.22x = 180,858,718.18
  5. Step 5: Solve for x
    x = 180,858,718.18/18,879.22
  6. Step 6: Final answer
    x = 9,579.78

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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.