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Finding the Fourth Proportional to 122,440.86, 168,955.42 and 68,731.78

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Solution

The fourth proportional to 122,440.86, 168,955.42 and 68,731.78 is: 94,842.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,440.86 : 168,955.42 = 68,731.78 : x
  2. Step 2: Convert to fraction form
    122,440.86/168,955.42 = 68,731.78/x
  3. Step 3: Cross multiply
    122,440.86x = 168,955.42 × 68,731.78
  4. Step 4: Simplify right side
    122,440.86x = 11,612,606,757.25
  5. Step 5: Solve for x
    x = 11,612,606,757.25/122,440.86
  6. Step 6: Final answer
    x = 94,842.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.