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Finding the Fourth Proportional to 72,758.56, 109,137.36 and 18,723.16

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Solution

The fourth proportional to 72,758.56, 109,137.36 and 18,723.16 is: 28,084.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,758.56 : 109,137.36 = 18,723.16 : x
  2. Step 2: Convert to fraction form
    72,758.56/109,137.36 = 18,723.16/x
  3. Step 3: Cross multiply
    72,758.56x = 109,137.36 × 18,723.16
  4. Step 4: Simplify right side
    72,758.56x = 2,043,396,253.26
  5. Step 5: Solve for x
    x = 2,043,396,253.26/72,758.56
  6. Step 6: Final answer
    x = 28,084.62

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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.