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Finding the Fourth Proportional to 100,715.15, 150,908.70 and 74,143.10

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Solution

The fourth proportional to 100,715.15, 150,908.70 and 74,143.10 is: 111,093.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,715.15 : 150,908.70 = 74,143.10 : x
  2. Step 2: Convert to fraction form
    100,715.15/150,908.70 = 74,143.10/x
  3. Step 3: Cross multiply
    100,715.15x = 150,908.70 × 74,143.10
  4. Step 4: Simplify right side
    100,715.15x = 11,188,838,834.97
  5. Step 5: Solve for x
    x = 11,188,838,834.97/100,715.15
  6. Step 6: Final answer
    x = 111,093.90

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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.