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Finding the Fourth Proportional to 426.35, 639.15 and 252.59

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Solution

The fourth proportional to 426.35, 639.15 and 252.59 is: 378.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.35 : 639.15 = 252.59 : x
  2. Step 2: Convert to fraction form
    426.35/639.15 = 252.59/x
  3. Step 3: Cross multiply
    426.35x = 639.15 × 252.59
  4. Step 4: Simplify right side
    426.35x = 161,442.90
  5. Step 5: Solve for x
    x = 161,442.90/426.35
  6. Step 6: Final answer
    x = 378.66

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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.