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Finding the Fourth Proportional to 638.90, 958.22 and 365.52

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Solution

The fourth proportional to 638.90, 958.22 and 365.52 is: 548.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.90 : 958.22 = 365.52 : x
  2. Step 2: Convert to fraction form
    638.90/958.22 = 365.52/x
  3. Step 3: Cross multiply
    638.90x = 958.22 × 365.52
  4. Step 4: Simplify right side
    638.90x = 350,248.57
  5. Step 5: Solve for x
    x = 350,248.57/638.90
  6. Step 6: Final answer
    x = 548.21

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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.