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Finding the Fourth Proportional to 207,694.60, 311,525.70 and 81,310.30

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Solution

The fourth proportional to 207,694.60, 311,525.70 and 81,310.30 is: 121,959.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,694.60 : 311,525.70 = 81,310.30 : x
  2. Step 2: Convert to fraction form
    207,694.60/311,525.70 = 81,310.30/x
  3. Step 3: Cross multiply
    207,694.60x = 311,525.70 × 81,310.30
  4. Step 4: Simplify right side
    207,694.60x = 25,330,248,124.71
  5. Step 5: Solve for x
    x = 25,330,248,124.71/207,694.60
  6. Step 6: Final answer
    x = 121,959.11

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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.