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Finding the Fourth Proportional to 626.72, 939.20 and 292.80

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Solution

The fourth proportional to 626.72, 939.20 and 292.80 is: 438.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.72 : 939.20 = 292.80 : x
  2. Step 2: Convert to fraction form
    626.72/939.20 = 292.80/x
  3. Step 3: Cross multiply
    626.72x = 939.20 × 292.80
  4. Step 4: Simplify right side
    626.72x = 274,997.76
  5. Step 5: Solve for x
    x = 274,997.76/626.72
  6. Step 6: Final answer
    x = 438.79

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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.