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Finding the Fourth Proportional to 121,894.11, 168,210.81 and 68,181.39

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Solution

The fourth proportional to 121,894.11, 168,210.81 and 68,181.39 is: 94,088.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,894.11 : 168,210.81 = 68,181.39 : x
  2. Step 2: Convert to fraction form
    121,894.11/168,210.81 = 68,181.39/x
  3. Step 3: Cross multiply
    121,894.11x = 168,210.81 × 68,181.39
  4. Step 4: Simplify right side
    121,894.11x = 11,468,846,838.83
  5. Step 5: Solve for x
    x = 11,468,846,838.83/121,894.11
  6. Step 6: Final answer
    x = 94,088.61

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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.