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Finding the Fourth Proportional to 81,940.68, 122,940.59 and 28,640.55

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Solution

The fourth proportional to 81,940.68, 122,940.59 and 28,640.55 is: 42,971.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,940.68 : 122,940.59 = 28,640.55 : x
  2. Step 2: Convert to fraction form
    81,940.68/122,940.59 = 28,640.55/x
  3. Step 3: Cross multiply
    81,940.68x = 122,940.59 × 28,640.55
  4. Step 4: Simplify right side
    81,940.68x = 3,521,086,432.75
  5. Step 5: Solve for x
    x = 3,521,086,432.75/81,940.68
  6. Step 6: Final answer
    x = 42,971.16

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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.