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Finding the Fourth Proportional to 121,889.94, 168,208.49 and 68,171.47

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Solution

The fourth proportional to 121,889.94, 168,208.49 and 68,171.47 is: 94,076.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,889.94 : 168,208.49 = 68,171.47 : x
  2. Step 2: Convert to fraction form
    121,889.94/168,208.49 = 68,171.47/x
  3. Step 3: Cross multiply
    121,889.94x = 168,208.49 × 68,171.47
  4. Step 4: Simplify right side
    121,889.94x = 11,467,019,613.48
  5. Step 5: Solve for x
    x = 11,467,019,613.48/121,889.94
  6. Step 6: Final answer
    x = 94,076.83

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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.