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Finding the Fourth Proportional to 207,720.20, 311,785.10 and 102,657.80

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Solution

The fourth proportional to 207,720.20, 311,785.10 and 102,657.80 is: 154,087.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,720.20 : 311,785.10 = 102,657.80 : x
  2. Step 2: Convert to fraction form
    207,720.20/311,785.10 = 102,657.80/x
  3. Step 3: Cross multiply
    207,720.20x = 311,785.10 × 102,657.80
  4. Step 4: Simplify right side
    207,720.20x = 32,007,172,438.78
  5. Step 5: Solve for x
    x = 32,007,172,438.78/207,720.20
  6. Step 6: Final answer
    x = 154,087.91

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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.