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Finding the Fourth Proportional to 72,234.02, 99,687.84 and 40,405.88

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Solution

The fourth proportional to 72,234.02, 99,687.84 and 40,405.88 is: 55,762.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,234.02 : 99,687.84 = 40,405.88 : x
  2. Step 2: Convert to fraction form
    72,234.02/99,687.84 = 40,405.88/x
  3. Step 3: Cross multiply
    72,234.02x = 99,687.84 × 40,405.88
  4. Step 4: Simplify right side
    72,234.02x = 4,027,974,900.50
  5. Step 5: Solve for x
    x = 4,027,974,900.50/72,234.02
  6. Step 6: Final answer
    x = 55,762.85

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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.