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Finding the Fourth Proportional to 418.71, 628.08 and 144.78

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Solution

The fourth proportional to 418.71, 628.08 and 144.78 is: 217.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.71 : 628.08 = 144.78 : x
  2. Step 2: Convert to fraction form
    418.71/628.08 = 144.78/x
  3. Step 3: Cross multiply
    418.71x = 628.08 × 144.78
  4. Step 4: Simplify right side
    418.71x = 90,933.42
  5. Step 5: Solve for x
    x = 90,933.42/418.71
  6. Step 6: Final answer
    x = 217.18

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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.