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Finding the Fourth Proportional to 418.99, 628.41 and 141.34

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Solution

The fourth proportional to 418.99, 628.41 and 141.34 is: 211.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.99 : 628.41 = 141.34 : x
  2. Step 2: Convert to fraction form
    418.99/628.41 = 141.34/x
  3. Step 3: Cross multiply
    418.99x = 628.41 × 141.34
  4. Step 4: Simplify right side
    418.99x = 88,819.47
  5. Step 5: Solve for x
    x = 88,819.47/418.99
  6. Step 6: Final answer
    x = 211.98

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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.