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Finding the Fourth Proportional to 418.20, 627.44 and 144.47

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Solution

The fourth proportional to 418.20, 627.44 and 144.47 is: 216.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.20 : 627.44 = 144.47 : x
  2. Step 2: Convert to fraction form
    418.20/627.44 = 144.47/x
  3. Step 3: Cross multiply
    418.20x = 627.44 × 144.47
  4. Step 4: Simplify right side
    418.20x = 90,642.40
  5. Step 5: Solve for x
    x = 90,642.40/418.20
  6. Step 6: Final answer
    x = 216.74

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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.