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Finding the Fourth Proportional to 418.54, 627.38 and 187.18

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Solution

The fourth proportional to 418.54, 627.38 and 187.18 is: 280.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.54 : 627.38 = 187.18 : x
  2. Step 2: Convert to fraction form
    418.54/627.38 = 187.18/x
  3. Step 3: Cross multiply
    418.54x = 627.38 × 187.18
  4. Step 4: Simplify right side
    418.54x = 117,432.99
  5. Step 5: Solve for x
    x = 117,432.99/418.54
  6. Step 6: Final answer
    x = 280.58

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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.