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Finding the Fourth Proportional to 426.18, 638.91 and 169.50

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Solution

The fourth proportional to 426.18, 638.91 and 169.50 is: 254.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.18 : 638.91 = 169.50 : x
  2. Step 2: Convert to fraction form
    426.18/638.91 = 169.50/x
  3. Step 3: Cross multiply
    426.18x = 638.91 × 169.50
  4. Step 4: Simplify right side
    426.18x = 108,295.25
  5. Step 5: Solve for x
    x = 108,295.25/426.18
  6. Step 6: Final answer
    x = 254.11

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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.