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Finding the Fourth Proportional to 418.85, 628.37 and 126.37

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Solution

The fourth proportional to 418.85, 628.37 and 126.37 is: 189.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.85 : 628.37 = 126.37 : x
  2. Step 2: Convert to fraction form
    418.85/628.37 = 126.37/x
  3. Step 3: Cross multiply
    418.85x = 628.37 × 126.37
  4. Step 4: Simplify right side
    418.85x = 79,407.74
  5. Step 5: Solve for x
    x = 79,407.74/418.85
  6. Step 6: Final answer
    x = 189.58

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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.