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Finding the Fourth Proportional to 426.76, 639.58 and 170.44

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Solution

The fourth proportional to 426.76, 639.58 and 170.44 is: 255.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.76 : 639.58 = 170.44 : x
  2. Step 2: Convert to fraction form
    426.76/639.58 = 170.44/x
  3. Step 3: Cross multiply
    426.76x = 639.58 × 170.44
  4. Step 4: Simplify right side
    426.76x = 109,010.02
  5. Step 5: Solve for x
    x = 109,010.02/426.76
  6. Step 6: Final answer
    x = 255.44

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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.