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Finding the Fourth Proportional to 121,857.40, 168,162.06 and 68,141.80

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Solution

The fourth proportional to 121,857.40, 168,162.06 and 68,141.80 is: 94,035.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,857.40 : 168,162.06 = 68,141.80 : x
  2. Step 2: Convert to fraction form
    121,857.40/168,162.06 = 68,141.80/x
  3. Step 3: Cross multiply
    121,857.40x = 168,162.06 × 68,141.80
  4. Step 4: Simplify right side
    121,857.40x = 11,458,865,460.11
  5. Step 5: Solve for x
    x = 11,458,865,460.11/121,857.40
  6. Step 6: Final answer
    x = 94,035.04

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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.