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Finding the Fourth Proportional to 73,120.20, 109,709.10 and 28,739.40

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Solution

The fourth proportional to 73,120.20, 109,709.10 and 28,739.40 is: 43,120.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,120.20 : 109,709.10 = 28,739.40 : x
  2. Step 2: Convert to fraction form
    73,120.20/109,709.10 = 28,739.40/x
  3. Step 3: Cross multiply
    73,120.20x = 109,709.10 × 28,739.40
  4. Step 4: Simplify right side
    73,120.20x = 3,152,973,708.54
  5. Step 5: Solve for x
    x = 3,152,973,708.54/73,120.20
  6. Step 6: Final answer
    x = 43,120.42

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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.