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Finding the Fourth Proportional to 72,387.92, 99,905.19 and 40,563.56

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Solution

The fourth proportional to 72,387.92, 99,905.19 and 40,563.56 is: 55,983.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,387.92 : 99,905.19 = 40,563.56 : x
  2. Step 2: Convert to fraction form
    72,387.92/99,905.19 = 40,563.56/x
  3. Step 3: Cross multiply
    72,387.92x = 99,905.19 × 40,563.56
  4. Step 4: Simplify right side
    72,387.92x = 4,052,510,168.88
  5. Step 5: Solve for x
    x = 4,052,510,168.88/72,387.92
  6. Step 6: Final answer
    x = 55,983.24

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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.