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Finding the Fourth Proportional to 105,539.80, 158,540.10 and 74,435.80

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Solution

The fourth proportional to 105,539.80, 158,540.10 and 74,435.80 is: 111,816.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,539.80 : 158,540.10 = 74,435.80 : x
  2. Step 2: Convert to fraction form
    105,539.80/158,540.10 = 74,435.80/x
  3. Step 3: Cross multiply
    105,539.80x = 158,540.10 × 74,435.80
  4. Step 4: Simplify right side
    105,539.80x = 11,801,059,175.58
  5. Step 5: Solve for x
    x = 11,801,059,175.58/105,539.80
  6. Step 6: Final answer
    x = 111,816.20

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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.