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Finding the Fourth Proportional to 73,340.40, 109,999.80 and 20,755.20

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Solution

The fourth proportional to 73,340.40, 109,999.80 and 20,755.20 is: 31,129.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,340.40 : 109,999.80 = 20,755.20 : x
  2. Step 2: Convert to fraction form
    73,340.40/109,999.80 = 20,755.20/x
  3. Step 3: Cross multiply
    73,340.40x = 109,999.80 × 20,755.20
  4. Step 4: Simplify right side
    73,340.40x = 2,283,067,848.96
  5. Step 5: Solve for x
    x = 2,283,067,848.96/73,340.40
  6. Step 6: Final answer
    x = 31,129.74

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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.