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Finding the Fourth Proportional to 626.90, 939.73 and 407.49

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Solution

The fourth proportional to 626.90, 939.73 and 407.49 is: 610.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.90 : 939.73 = 407.49 : x
  2. Step 2: Convert to fraction form
    626.90/939.73 = 407.49/x
  3. Step 3: Cross multiply
    626.90x = 939.73 × 407.49
  4. Step 4: Simplify right side
    626.90x = 382,930.58
  5. Step 5: Solve for x
    x = 382,930.58/626.90
  6. Step 6: Final answer
    x = 610.83

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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.