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Finding the Fourth Proportional to 418.74, 628 and 144.78

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Solution

The fourth proportional to 418.74, 628 and 144.78 is: 217.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.74 : 628 = 144.78 : x
  2. Step 2: Convert to fraction form
    418.74/628 = 144.78/x
  3. Step 3: Cross multiply
    418.74x = 628 × 144.78
  4. Step 4: Simplify right side
    418.74x = 90,921.84
  5. Step 5: Solve for x
    x = 90,921.84/418.74
  6. Step 6: Final answer
    x = 217.13

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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.