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Finding the Fourth Proportional to 418.84, 627.72 and 272.56

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Solution

The fourth proportional to 418.84, 627.72 and 272.56 is: 408.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.84 : 627.72 = 272.56 : x
  2. Step 2: Convert to fraction form
    418.84/627.72 = 272.56/x
  3. Step 3: Cross multiply
    418.84x = 627.72 × 272.56
  4. Step 4: Simplify right side
    418.84x = 171,091.36
  5. Step 5: Solve for x
    x = 171,091.36/418.84
  6. Step 6: Final answer
    x = 408.49

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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.