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Finding the Fourth Proportional to 427, 640.60 and 138.44

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Solution

The fourth proportional to 427, 640.60 and 138.44 is: 207.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    427 : 640.60 = 138.44 : x
  2. Step 2: Convert to fraction form
    427/640.60 = 138.44/x
  3. Step 3: Cross multiply
    427x = 640.60 × 138.44
  4. Step 4: Simplify right side
    427x = 88,683.41
  5. Step 5: Solve for x
    x = 88,683.41/427
  6. Step 6: Final answer
    x = 207.69

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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.