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Finding the Fourth Proportional to 81,813.55, 122,708.01 and 28,513.62

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Solution

The fourth proportional to 81,813.55, 122,708.01 and 28,513.62 is: 42,766.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,813.55 : 122,708.01 = 28,513.62 : x
  2. Step 2: Convert to fraction form
    81,813.55/122,708.01 = 28,513.62/x
  3. Step 3: Cross multiply
    81,813.55x = 122,708.01 × 28,513.62
  4. Step 4: Simplify right side
    81,813.55x = 3,498,849,568.10
  5. Step 5: Solve for x
    x = 3,498,849,568.10/81,813.55
  6. Step 6: Final answer
    x = 42,766.14

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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.