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Finding the Fourth Proportional to 626.96, 939.68 and 261.36

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Solution

The fourth proportional to 626.96, 939.68 and 261.36 is: 391.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.96 : 939.68 = 261.36 : x
  2. Step 2: Convert to fraction form
    626.96/939.68 = 261.36/x
  3. Step 3: Cross multiply
    626.96x = 939.68 × 261.36
  4. Step 4: Simplify right side
    626.96x = 245,594.76
  5. Step 5: Solve for x
    x = 245,594.76/626.96
  6. Step 6: Final answer
    x = 391.72

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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.