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Finding the Fourth Proportional to 73,285.79, 109,935.17 and 39,991.55

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Solution

The fourth proportional to 73,285.79, 109,935.17 and 39,991.55 is: 59,990.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,285.79 : 109,935.17 = 39,991.55 : x
  2. Step 2: Convert to fraction form
    73,285.79/109,935.17 = 39,991.55/x
  3. Step 3: Cross multiply
    73,285.79x = 109,935.17 × 39,991.55
  4. Step 4: Simplify right side
    73,285.79x = 4,396,477,647.86
  5. Step 5: Solve for x
    x = 4,396,477,647.86/73,285.79
  6. Step 6: Final answer
    x = 59,990.86

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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.