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Finding the Fourth Proportional to 418.91, 628.56 and 361.49

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Solution

The fourth proportional to 418.91, 628.56 and 361.49 is: 542.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.91 : 628.56 = 361.49 : x
  2. Step 2: Convert to fraction form
    418.91/628.56 = 361.49/x
  3. Step 3: Cross multiply
    418.91x = 628.56 × 361.49
  4. Step 4: Simplify right side
    418.91x = 227,215.01
  5. Step 5: Solve for x
    x = 227,215.01/418.91
  6. Step 6: Final answer
    x = 542.40

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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.