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Finding the Fourth Proportional to 91,243.80, 136,635.30 and 72,811.80

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Solution

The fourth proportional to 91,243.80, 136,635.30 and 72,811.80 is: 109,033.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,243.80 : 136,635.30 = 72,811.80 : x
  2. Step 2: Convert to fraction form
    91,243.80/136,635.30 = 72,811.80/x
  3. Step 3: Cross multiply
    91,243.80x = 136,635.30 × 72,811.80
  4. Step 4: Simplify right side
    91,243.80x = 9,948,662,136.54
  5. Step 5: Solve for x
    x = 9,948,662,136.54/91,243.80
  6. Step 6: Final answer
    x = 109,033.84

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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.