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Finding the Fourth Proportional to 81,470.88, 122,221.91 and 28,160.93

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Solution

The fourth proportional to 81,470.88, 122,221.91 and 28,160.93 is: 42,246.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,470.88 : 122,221.91 = 28,160.93 : x
  2. Step 2: Convert to fraction form
    81,470.88/122,221.91 = 28,160.93/x
  3. Step 3: Cross multiply
    81,470.88x = 122,221.91 × 28,160.93
  4. Step 4: Simplify right side
    81,470.88x = 3,441,883,027.93
  5. Step 5: Solve for x
    x = 3,441,883,027.93/81,470.88
  6. Step 6: Final answer
    x = 42,246.79

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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.