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Finding the Fourth Proportional to 121,754.60, 168,020.86 and 68,039.60

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Solution

The fourth proportional to 121,754.60, 168,020.86 and 68,039.60 is: 93,894.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,754.60 : 168,020.86 = 68,039.60 : x
  2. Step 2: Convert to fraction form
    121,754.60/168,020.86 = 68,039.60/x
  3. Step 3: Cross multiply
    121,754.60x = 168,020.86 × 68,039.60
  4. Step 4: Simplify right side
    121,754.60x = 11,432,071,765.86
  5. Step 5: Solve for x
    x = 11,432,071,765.86/121,754.60
  6. Step 6: Final answer
    x = 93,894.37

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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.