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Finding the Fourth Proportional to 121,811.64, 168,101.31 and 68,099.64

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Solution

The fourth proportional to 121,811.64, 168,101.31 and 68,099.64 is: 93,978.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,811.64 : 168,101.31 = 68,099.64 : x
  2. Step 2: Convert to fraction form
    121,811.64/168,101.31 = 68,099.64/x
  3. Step 3: Cross multiply
    121,811.64x = 168,101.31 × 68,099.64
  4. Step 4: Simplify right side
    121,811.64x = 11,447,638,694.53
  5. Step 5: Solve for x
    x = 11,447,638,694.53/121,811.64
  6. Step 6: Final answer
    x = 93,978.20

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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.