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Finding the Fourth Proportional to 73,129.70, 109,706.15 and 28,149.49

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Solution

The fourth proportional to 73,129.70, 109,706.15 and 28,149.49 is: 42,228.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,129.70 : 109,706.15 = 28,149.49 : x
  2. Step 2: Convert to fraction form
    73,129.70/109,706.15 = 28,149.49/x
  3. Step 3: Cross multiply
    73,129.70x = 109,706.15 × 28,149.49
  4. Step 4: Simplify right side
    73,129.70x = 3,088,171,483.09
  5. Step 5: Solve for x
    x = 3,088,171,483.09/73,129.70
  6. Step 6: Final answer
    x = 42,228.69

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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.