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Finding the Fourth Proportional to 121,742.21, 168,001.07 and 68,027.60

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Solution

The fourth proportional to 121,742.21, 168,001.07 and 68,027.60 is: 93,876.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,742.21 : 168,001.07 = 68,027.60 : x
  2. Step 2: Convert to fraction form
    121,742.21/168,001.07 = 68,027.60/x
  3. Step 3: Cross multiply
    121,742.21x = 168,001.07 × 68,027.60
  4. Step 4: Simplify right side
    121,742.21x = 11,428,708,409.39
  5. Step 5: Solve for x
    x = 11,428,708,409.39/121,742.21
  6. Step 6: Final answer
    x = 93,876.31

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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.