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Finding the Fourth Proportional to 73,169.60, 109,678.80 and 39,819.20

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Solution

The fourth proportional to 73,169.60, 109,678.80 and 39,819.20 is: 59,687.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,169.60 : 109,678.80 = 39,819.20 : x
  2. Step 2: Convert to fraction form
    73,169.60/109,678.80 = 39,819.20/x
  3. Step 3: Cross multiply
    73,169.60x = 109,678.80 × 39,819.20
  4. Step 4: Simplify right side
    73,169.60x = 4,367,322,072.96
  5. Step 5: Solve for x
    x = 4,367,322,072.96/73,169.60
  6. Step 6: Final answer
    x = 59,687.66

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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.