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Finding the Fourth Proportional to 626.30, 939.56 and 215.42

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Solution

The fourth proportional to 626.30, 939.56 and 215.42 is: 323.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.30 : 939.56 = 215.42 : x
  2. Step 2: Convert to fraction form
    626.30/939.56 = 215.42/x
  3. Step 3: Cross multiply
    626.30x = 939.56 × 215.42
  4. Step 4: Simplify right side
    626.30x = 202,400.02
  5. Step 5: Solve for x
    x = 202,400.02/626.30
  6. Step 6: Final answer
    x = 323.17

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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.