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Finding the Fourth Proportional to 208,989.20, 313,505.64 and 68,758.88

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Solution

The fourth proportional to 208,989.20, 313,505.64 and 68,758.88 is: 103,145.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,989.20 : 313,505.64 = 68,758.88 : x
  2. Step 2: Convert to fraction form
    208,989.20/313,505.64 = 68,758.88/x
  3. Step 3: Cross multiply
    208,989.20x = 313,505.64 × 68,758.88
  4. Step 4: Simplify right side
    208,989.20x = 21,556,296,680.08
  5. Step 5: Solve for x
    x = 21,556,296,680.08/208,989.20
  6. Step 6: Final answer
    x = 103,145.51

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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.