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Finding the Fourth Proportional to 91,806.70, 137,791.05 and 54,319.90

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Solution

The fourth proportional to 91,806.70, 137,791.05 and 54,319.90 is: 81,527.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,806.70 : 137,791.05 = 54,319.90 : x
  2. Step 2: Convert to fraction form
    91,806.70/137,791.05 = 54,319.90/x
  3. Step 3: Cross multiply
    91,806.70x = 137,791.05 × 54,319.90
  4. Step 4: Simplify right side
    91,806.70x = 7,484,796,056.90
  5. Step 5: Solve for x
    x = 7,484,796,056.90/91,806.70
  6. Step 6: Final answer
    x = 81,527.78

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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.