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Finding the Fourth Proportional to 418.89, 627.40 and 408.56

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Solution

The fourth proportional to 418.89, 627.40 and 408.56 is: 611.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.89 : 627.40 = 408.56 : x
  2. Step 2: Convert to fraction form
    418.89/627.40 = 408.56/x
  3. Step 3: Cross multiply
    418.89x = 627.40 × 408.56
  4. Step 4: Simplify right side
    418.89x = 256,331.09
  5. Step 5: Solve for x
    x = 256,331.09/418.89
  6. Step 6: Final answer
    x = 611.93

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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.