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Finding the Fourth Proportional to 91,751.20, 137,626.80 and 80,087.20

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Solution

The fourth proportional to 91,751.20, 137,626.80 and 80,087.20 is: 120,130.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,751.20 : 137,626.80 = 80,087.20 : x
  2. Step 2: Convert to fraction form
    91,751.20/137,626.80 = 80,087.20/x
  3. Step 3: Cross multiply
    91,751.20x = 137,626.80 × 80,087.20
  4. Step 4: Simplify right side
    91,751.20x = 11,022,145,056.96
  5. Step 5: Solve for x
    x = 11,022,145,056.96/91,751.20
  6. Step 6: Final answer
    x = 120,130.80

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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.