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Finding the Fourth Proportional to 644.05, 888.45 and 496.63

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Solution

The fourth proportional to 644.05, 888.45 and 496.63 is: 685.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.05 : 888.45 = 496.63 : x
  2. Step 2: Convert to fraction form
    644.05/888.45 = 496.63/x
  3. Step 3: Cross multiply
    644.05x = 888.45 × 496.63
  4. Step 4: Simplify right side
    644.05x = 441,230.92
  5. Step 5: Solve for x
    x = 441,230.92/644.05
  6. Step 6: Final answer
    x = 685.09

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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.