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Finding the Fourth Proportional to 121,912.92, 168,253.77 and 68,211.54

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Solution

The fourth proportional to 121,912.92, 168,253.77 and 68,211.54 is: 94,139.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,912.92 : 168,253.77 = 68,211.54 : x
  2. Step 2: Convert to fraction form
    121,912.92/168,253.77 = 68,211.54/x
  3. Step 3: Cross multiply
    121,912.92x = 168,253.77 × 68,211.54
  4. Step 4: Simplify right side
    121,912.92x = 11,476,848,762.51
  5. Step 5: Solve for x
    x = 11,476,848,762.51/121,912.92
  6. Step 6: Final answer
    x = 94,139.72

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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.