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Finding the Fourth Proportional to 73,279.76, 109,917.81 and 20,688.48

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Solution

The fourth proportional to 73,279.76, 109,917.81 and 20,688.48 is: 31,032.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,279.76 : 109,917.81 = 20,688.48 : x
  2. Step 2: Convert to fraction form
    73,279.76/109,917.81 = 20,688.48/x
  3. Step 3: Cross multiply
    73,279.76x = 109,917.81 × 20,688.48
  4. Step 4: Simplify right side
    73,279.76x = 2,274,032,413.83
  5. Step 5: Solve for x
    x = 2,274,032,413.83/73,279.76
  6. Step 6: Final answer
    x = 31,032.21

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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.