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Finding the Fourth Proportional to 418.86, 628.56 and 213.48

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Solution

The fourth proportional to 418.86, 628.56 and 213.48 is: 320.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.86 : 628.56 = 213.48 : x
  2. Step 2: Convert to fraction form
    418.86/628.56 = 213.48/x
  3. Step 3: Cross multiply
    418.86x = 628.56 × 213.48
  4. Step 4: Simplify right side
    418.86x = 134,184.99
  5. Step 5: Solve for x
    x = 134,184.99/418.86
  6. Step 6: Final answer
    x = 320.36

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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.