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Finding the Fourth Proportional to 626.43, 939.78 and 215.59

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Solution

The fourth proportional to 626.43, 939.78 and 215.59 is: 323.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.43 : 939.78 = 215.59 : x
  2. Step 2: Convert to fraction form
    626.43/939.78 = 215.59/x
  3. Step 3: Cross multiply
    626.43x = 939.78 × 215.59
  4. Step 4: Simplify right side
    626.43x = 202,603.33
  5. Step 5: Solve for x
    x = 202,603.33/626.43
  6. Step 6: Final answer
    x = 323.42

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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.