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Finding the Fourth Proportional to 121,862, 168,192.60 and 68,870

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Solution

The fourth proportional to 121,862, 168,192.60 and 68,870 is: 95,053.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,862 : 168,192.60 = 68,870 : x
  2. Step 2: Convert to fraction form
    121,862/168,192.60 = 68,870/x
  3. Step 3: Cross multiply
    121,862x = 168,192.60 × 68,870
  4. Step 4: Simplify right side
    121,862x = 11,583,424,362
  5. Step 5: Solve for x
    x = 11,583,424,362/121,862
  6. Step 6: Final answer
    x = 95,053.62

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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.