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Finding the Fourth Proportional to 626.82, 939.20 and 215.74

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Solution

The fourth proportional to 626.82, 939.20 and 215.74 is: 323.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.82 : 939.20 = 215.74 : x
  2. Step 2: Convert to fraction form
    626.82/939.20 = 215.74/x
  3. Step 3: Cross multiply
    626.82x = 939.20 × 215.74
  4. Step 4: Simplify right side
    626.82x = 202,623.01
  5. Step 5: Solve for x
    x = 202,623.01/626.82
  6. Step 6: Final answer
    x = 323.26

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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.