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Finding the Fourth Proportional to 91,687.20, 137,611.80 and 54,200.40

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Solution

The fourth proportional to 91,687.20, 137,611.80 and 54,200.40 is: 81,348.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,687.20 : 137,611.80 = 54,200.40 : x
  2. Step 2: Convert to fraction form
    91,687.20/137,611.80 = 54,200.40/x
  3. Step 3: Cross multiply
    91,687.20x = 137,611.80 × 54,200.40
  4. Step 4: Simplify right side
    91,687.20x = 7,458,614,604.72
  5. Step 5: Solve for x
    x = 7,458,614,604.72/91,687.20
  6. Step 6: Final answer
    x = 81,348.48

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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.