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Finding the Fourth Proportional to 121,910.52, 168,249.18 and 70,229.40

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Solution

The fourth proportional to 121,910.52, 168,249.18 and 70,229.40 is: 96,923.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,910.52 : 168,249.18 = 70,229.40 : x
  2. Step 2: Convert to fraction form
    121,910.52/168,249.18 = 70,229.40/x
  3. Step 3: Cross multiply
    121,910.52x = 168,249.18 × 70,229.40
  4. Step 4: Simplify right side
    121,910.52x = 11,816,038,961.89
  5. Step 5: Solve for x
    x = 11,816,038,961.89/121,910.52
  6. Step 6: Final answer
    x = 96,923.87

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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.