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Finding the Fourth Proportional to 426.87, 639.80 and 195.56

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Solution

The fourth proportional to 426.87, 639.80 and 195.56 is: 293.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.87 : 639.80 = 195.56 : x
  2. Step 2: Convert to fraction form
    426.87/639.80 = 195.56/x
  3. Step 3: Cross multiply
    426.87x = 639.80 × 195.56
  4. Step 4: Simplify right side
    426.87x = 125,121.84
  5. Step 5: Solve for x
    x = 125,121.84/426.87
  6. Step 6: Final answer
    x = 293.11

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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.