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Finding the Fourth Proportional to 99,812.70, 149,719.05 and 80,129.70

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Solution

The fourth proportional to 99,812.70, 149,719.05 and 80,129.70 is: 120,194.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,812.70 : 149,719.05 = 80,129.70 : x
  2. Step 2: Convert to fraction form
    99,812.70/149,719.05 = 80,129.70/x
  3. Step 3: Cross multiply
    99,812.70x = 149,719.05 × 80,129.70
  4. Step 4: Simplify right side
    99,812.70x = 11,996,942,560.79
  5. Step 5: Solve for x
    x = 11,996,942,560.79/99,812.70
  6. Step 6: Final answer
    x = 120,194.55

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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.