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Finding the Fourth Proportional to 72,751.56, 109,126.86 and 18,716.16

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Solution

The fourth proportional to 72,751.56, 109,126.86 and 18,716.16 is: 28,074.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,751.56 : 109,126.86 = 18,716.16 : x
  2. Step 2: Convert to fraction form
    72,751.56/109,126.86 = 18,716.16/x
  3. Step 3: Cross multiply
    72,751.56x = 109,126.86 × 18,716.16
  4. Step 4: Simplify right side
    72,751.56x = 2,042,435,772.06
  5. Step 5: Solve for x
    x = 2,042,435,772.06/72,751.56
  6. Step 6: Final answer
    x = 28,074.12

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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.