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Finding the Fourth Proportional to 72,391.93, 99,900.79 and 40,561.05

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Solution

The fourth proportional to 72,391.93, 99,900.79 and 40,561.05 is: 55,974.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,391.93 : 99,900.79 = 40,561.05 : x
  2. Step 2: Convert to fraction form
    72,391.93/99,900.79 = 40,561.05/x
  3. Step 3: Cross multiply
    72,391.93x = 99,900.79 × 40,561.05
  4. Step 4: Simplify right side
    72,391.93x = 4,052,081,439.61
  5. Step 5: Solve for x
    x = 4,052,081,439.61/72,391.93
  6. Step 6: Final answer
    x = 55,974.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.