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Finding the Fourth Proportional to 121,871.52, 168,191.28 and 68,161.55

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Solution

The fourth proportional to 121,871.52, 168,191.28 and 68,161.55 is: 94,067.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,871.52 : 168,191.28 = 68,161.55 : x
  2. Step 2: Convert to fraction form
    121,871.52/168,191.28 = 68,161.55/x
  3. Step 3: Cross multiply
    121,871.52x = 168,191.28 × 68,161.55
  4. Step 4: Simplify right side
    121,871.52x = 11,464,177,500.33
  5. Step 5: Solve for x
    x = 11,464,177,500.33/121,871.52
  6. Step 6: Final answer
    x = 94,067.73

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1.5x scale

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.