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Finding the Fourth Proportional to 121,789.64, 168,069.23 and 68,074.64

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Solution

The fourth proportional to 121,789.64, 168,069.23 and 68,074.64 is: 93,942.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,789.64 : 168,069.23 = 68,074.64 : x
  2. Step 2: Convert to fraction form
    121,789.64/168,069.23 = 68,074.64/x
  3. Step 3: Cross multiply
    121,789.64x = 168,069.23 × 68,074.64
  4. Step 4: Simplify right side
    121,789.64x = 11,441,252,977.54
  5. Step 5: Solve for x
    x = 11,441,252,977.54/121,789.64
  6. Step 6: Final answer
    x = 93,942.74

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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.