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Finding the Fourth Proportional to 418.13, 627.18 and 144.15

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Solution

The fourth proportional to 418.13, 627.18 and 144.15 is: 216.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.13 : 627.18 = 144.15 : x
  2. Step 2: Convert to fraction form
    418.13/627.18 = 144.15/x
  3. Step 3: Cross multiply
    418.13x = 627.18 × 144.15
  4. Step 4: Simplify right side
    418.13x = 90,405.10
  5. Step 5: Solve for x
    x = 90,405.10/418.13
  6. Step 6: Final answer
    x = 216.21

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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.