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Finding the Fourth Proportional to 426.42, 639.64 and 166.56

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Solution

The fourth proportional to 426.42, 639.64 and 166.56 is: 249.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.42 : 639.64 = 166.56 : x
  2. Step 2: Convert to fraction form
    426.42/639.64 = 166.56/x
  3. Step 3: Cross multiply
    426.42x = 639.64 × 166.56
  4. Step 4: Simplify right side
    426.42x = 106,538.44
  5. Step 5: Solve for x
    x = 106,538.44/426.42
  6. Step 6: Final answer
    x = 249.84

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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.