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Finding the Fourth Proportional to 28,919.20, 43,413.90 and 18,389.20

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Solution

The fourth proportional to 28,919.20, 43,413.90 and 18,389.20 is: 27,606.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,919.20 : 43,413.90 = 18,389.20 : x
  2. Step 2: Convert to fraction form
    28,919.20/43,413.90 = 18,389.20/x
  3. Step 3: Cross multiply
    28,919.20x = 43,413.90 × 18,389.20
  4. Step 4: Simplify right side
    28,919.20x = 798,346,889.88
  5. Step 5: Solve for x
    x = 798,346,889.88/28,919.20
  6. Step 6: Final answer
    x = 27,606.12

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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.