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Finding the Fourth Proportional to 44,139.69, 66,120.89 and 20,413.98

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Solution

The fourth proportional to 44,139.69, 66,120.89 and 20,413.98 is: 30,579.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    44,139.69 : 66,120.89 = 20,413.98 : x
  2. Step 2: Convert to fraction form
    44,139.69/66,120.89 = 20,413.98/x
  3. Step 3: Cross multiply
    44,139.69x = 66,120.89 × 20,413.98
  4. Step 4: Simplify right side
    44,139.69x = 1,349,790,526.04
  5. Step 5: Solve for x
    x = 1,349,790,526.04/44,139.69
  6. Step 6: Final answer
    x = 30,579.97

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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.