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Finding the Fourth Proportional to 626.76, 939.88 and 215.78

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Solution

The fourth proportional to 626.76, 939.88 and 215.78 is: 323.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.76 : 939.88 = 215.78 : x
  2. Step 2: Convert to fraction form
    626.76/939.88 = 215.78/x
  3. Step 3: Cross multiply
    626.76x = 939.88 × 215.78
  4. Step 4: Simplify right side
    626.76x = 202,807.31
  5. Step 5: Solve for x
    x = 202,807.31/626.76
  6. Step 6: Final answer
    x = 323.58

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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.