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Finding the Fourth Proportional to 418.78, 627.37 and 262.65

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Solution

The fourth proportional to 418.78, 627.37 and 262.65 is: 393.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.78 : 627.37 = 262.65 : x
  2. Step 2: Convert to fraction form
    418.78/627.37 = 262.65/x
  3. Step 3: Cross multiply
    418.78x = 627.37 × 262.65
  4. Step 4: Simplify right side
    418.78x = 164,778.73
  5. Step 5: Solve for x
    x = 164,778.73/418.78
  6. Step 6: Final answer
    x = 393.47

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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.