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Finding the Fourth Proportional to 418.69, 628.15 and 126.18

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Solution

The fourth proportional to 418.69, 628.15 and 126.18 is: 189.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.69 : 628.15 = 126.18 : x
  2. Step 2: Convert to fraction form
    418.69/628.15 = 126.18/x
  3. Step 3: Cross multiply
    418.69x = 628.15 × 126.18
  4. Step 4: Simplify right side
    418.69x = 79,259.65
  5. Step 5: Solve for x
    x = 79,259.65/418.69
  6. Step 6: Final answer
    x = 189.31

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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.