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Finding the Fourth Proportional to 626.13, 939.42 and 421.09

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Solution

The fourth proportional to 626.13, 939.42 and 421.09 is: 631.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.13 : 939.42 = 421.09 : x
  2. Step 2: Convert to fraction form
    626.13/939.42 = 421.09/x
  3. Step 3: Cross multiply
    626.13x = 939.42 × 421.09
  4. Step 4: Simplify right side
    626.13x = 395,578.02
  5. Step 5: Solve for x
    x = 395,578.02/626.13
  6. Step 6: Final answer
    x = 631.78

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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.