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Finding the Fourth Proportional to 426.18, 639.35 and 169.70

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Solution

The fourth proportional to 426.18, 639.35 and 169.70 is: 254.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.18 : 639.35 = 169.70 : x
  2. Step 2: Convert to fraction form
    426.18/639.35 = 169.70/x
  3. Step 3: Cross multiply
    426.18x = 639.35 × 169.70
  4. Step 4: Simplify right side
    426.18x = 108,497.70
  5. Step 5: Solve for x
    x = 108,497.70/426.18
  6. Step 6: Final answer
    x = 254.58

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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.