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Finding the Fourth Proportional to 626.76, 939.14 and 420.54

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Solution

The fourth proportional to 626.76, 939.14 and 420.54 is: 630.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.76 : 939.14 = 420.54 : x
  2. Step 2: Convert to fraction form
    626.76/939.14 = 420.54/x
  3. Step 3: Cross multiply
    626.76x = 939.14 × 420.54
  4. Step 4: Simplify right side
    626.76x = 394,945.94
  5. Step 5: Solve for x
    x = 394,945.94/626.76
  6. Step 6: Final answer
    x = 630.14

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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.