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Finding the Fourth Proportional to 121,278.80, 181,918.20 and 68,790.80

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Solution

The fourth proportional to 121,278.80, 181,918.20 and 68,790.80 is: 103,186.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,278.80 : 181,918.20 = 68,790.80 : x
  2. Step 2: Convert to fraction form
    121,278.80/181,918.20 = 68,790.80/x
  3. Step 3: Cross multiply
    121,278.80x = 181,918.20 × 68,790.80
  4. Step 4: Simplify right side
    121,278.80x = 12,514,298,512.56
  5. Step 5: Solve for x
    x = 12,514,298,512.56/121,278.80
  6. Step 6: Final answer
    x = 103,186.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.