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Finding the Fourth Proportional to 81,487.81, 122,239.41 and 28,884.79

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Solution

The fourth proportional to 81,487.81, 122,239.41 and 28,884.79 is: 43,329.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,487.81 : 122,239.41 = 28,884.79 : x
  2. Step 2: Convert to fraction form
    81,487.81/122,239.41 = 28,884.79/x
  3. Step 3: Cross multiply
    81,487.81x = 122,239.41 × 28,884.79
  4. Step 4: Simplify right side
    81,487.81x = 3,530,859,687.57
  5. Step 5: Solve for x
    x = 3,530,859,687.57/81,487.81
  6. Step 6: Final answer
    x = 43,329.91

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1.5x scale

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.