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Finding the Fourth Proportional to 121,917.83, 168,242.69 and 68,201.69

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Solution

The fourth proportional to 121,917.83, 168,242.69 and 68,201.69 is: 94,116.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,917.83 : 168,242.69 = 68,201.69 : x
  2. Step 2: Convert to fraction form
    121,917.83/168,242.69 = 68,201.69/x
  3. Step 3: Cross multiply
    121,917.83x = 168,242.69 × 68,201.69
  4. Step 4: Simplify right side
    121,917.83x = 11,474,435,117.44
  5. Step 5: Solve for x
    x = 11,474,435,117.44/121,917.83
  6. Step 6: Final answer
    x = 94,116.14

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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.