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Finding the Fourth Proportional to 91,722.80, 137,584.20 and 36,318.80

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Solution

The fourth proportional to 91,722.80, 137,584.20 and 36,318.80 is: 54,478.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,722.80 : 137,584.20 = 36,318.80 : x
  2. Step 2: Convert to fraction form
    91,722.80/137,584.20 = 36,318.80/x
  3. Step 3: Cross multiply
    91,722.80x = 137,584.20 × 36,318.80
  4. Step 4: Simplify right side
    91,722.80x = 4,996,893,042.96
  5. Step 5: Solve for x
    x = 4,996,893,042.96/91,722.80
  6. Step 6: Final answer
    x = 54,478.20

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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.