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Finding the Fourth Proportional to 73,121.70, 109,682.55 and 28,749.90

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Solution

The fourth proportional to 73,121.70, 109,682.55 and 28,749.90 is: 43,124.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,121.70 : 109,682.55 = 28,749.90 : x
  2. Step 2: Convert to fraction form
    73,121.70/109,682.55 = 28,749.90/x
  3. Step 3: Cross multiply
    73,121.70x = 109,682.55 × 28,749.90
  4. Step 4: Simplify right side
    73,121.70x = 3,153,362,344.25
  5. Step 5: Solve for x
    x = 3,153,362,344.25/73,121.70
  6. Step 6: Final answer
    x = 43,124.85

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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.