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Finding the Fourth Proportional to 109,388.80, 164,083.20 and 81,740.80

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Solution

The fourth proportional to 109,388.80, 164,083.20 and 81,740.80 is: 122,611.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,388.80 : 164,083.20 = 81,740.80 : x
  2. Step 2: Convert to fraction form
    109,388.80/164,083.20 = 81,740.80/x
  3. Step 3: Cross multiply
    109,388.80x = 164,083.20 × 81,740.80
  4. Step 4: Simplify right side
    109,388.80x = 13,412,292,034.56
  5. Step 5: Solve for x
    x = 13,412,292,034.56/109,388.80
  6. Step 6: Final answer
    x = 122,611.20

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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.