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Finding the Fourth Proportional to 81,951.90, 122,922.99 and 28,640.13

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Solution

The fourth proportional to 81,951.90, 122,922.99 and 28,640.13 is: 42,958.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,951.90 : 122,922.99 = 28,640.13 : x
  2. Step 2: Convert to fraction form
    81,951.90/122,922.99 = 28,640.13/x
  3. Step 3: Cross multiply
    81,951.90x = 122,922.99 × 28,640.13
  4. Step 4: Simplify right side
    81,951.90x = 3,520,530,413.59
  5. Step 5: Solve for x
    x = 3,520,530,413.59/81,951.90
  6. Step 6: Final answer
    x = 42,958.50

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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.