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Finding the Fourth Proportional to 426.72, 639.84 and 170

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Solution

The fourth proportional to 426.72, 639.84 and 170 is: 254.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.72 : 639.84 = 170 : x
  2. Step 2: Convert to fraction form
    426.72/639.84 = 170/x
  3. Step 3: Cross multiply
    426.72x = 639.84 × 170
  4. Step 4: Simplify right side
    426.72x = 108,772.80
  5. Step 5: Solve for x
    x = 108,772.80/426.72
  6. Step 6: Final answer
    x = 254.90

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.