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Finding the Fourth Proportional to 626.81, 938.48 and 431.39

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Solution

The fourth proportional to 626.81, 938.48 and 431.39 is: 645.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.81 : 938.48 = 431.39 : x
  2. Step 2: Convert to fraction form
    626.81/938.48 = 431.39/x
  3. Step 3: Cross multiply
    626.81x = 938.48 × 431.39
  4. Step 4: Simplify right side
    626.81x = 404,851.08
  5. Step 5: Solve for x
    x = 404,851.08/626.81
  6. Step 6: Final answer
    x = 645.90

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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.