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Finding the Fourth Proportional to 419.27, 628.74 and 126.68

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Solution

The fourth proportional to 419.27, 628.74 and 126.68 is: 189.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.27 : 628.74 = 126.68 : x
  2. Step 2: Convert to fraction form
    419.27/628.74 = 126.68/x
  3. Step 3: Cross multiply
    419.27x = 628.74 × 126.68
  4. Step 4: Simplify right side
    419.27x = 79,648.78
  5. Step 5: Solve for x
    x = 79,648.78/419.27
  6. Step 6: Final answer
    x = 189.97

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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.