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Finding the Fourth Proportional to 418.44, 623.67 and 408.72

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Solution

The fourth proportional to 418.44, 623.67 and 408.72 is: 609.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.44 : 623.67 = 408.72 : x
  2. Step 2: Convert to fraction form
    418.44/623.67 = 408.72/x
  3. Step 3: Cross multiply
    418.44x = 623.67 × 408.72
  4. Step 4: Simplify right side
    418.44x = 254,906.40
  5. Step 5: Solve for x
    x = 254,906.40/418.44
  6. Step 6: Final answer
    x = 609.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.