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Finding the Fourth Proportional to 644.99, 890.13 and 361.43

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Solution

The fourth proportional to 644.99, 890.13 and 361.43 is: 498.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.99 : 890.13 = 361.43 : x
  2. Step 2: Convert to fraction form
    644.99/890.13 = 361.43/x
  3. Step 3: Cross multiply
    644.99x = 890.13 × 361.43
  4. Step 4: Simplify right side
    644.99x = 321,722.90
  5. Step 5: Solve for x
    x = 321,722.90/644.99
  6. Step 6: Final answer
    x = 498.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.