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Finding the Fourth Proportional to 418.62, 628.02 and 144.72

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Solution

The fourth proportional to 418.62, 628.02 and 144.72 is: 217.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.62 : 628.02 = 144.72 : x
  2. Step 2: Convert to fraction form
    418.62/628.02 = 144.72/x
  3. Step 3: Cross multiply
    418.62x = 628.02 × 144.72
  4. Step 4: Simplify right side
    418.62x = 90,887.05
  5. Step 5: Solve for x
    x = 90,887.05/418.62
  6. Step 6: Final answer
    x = 217.11

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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.