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Finding the Fourth Proportional to 644.73, 889.88 and 423.56

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Solution

The fourth proportional to 644.73, 889.88 and 423.56 is: 584.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.73 : 889.88 = 423.56 : x
  2. Step 2: Convert to fraction form
    644.73/889.88 = 423.56/x
  3. Step 3: Cross multiply
    644.73x = 889.88 × 423.56
  4. Step 4: Simplify right side
    644.73x = 376,911.01
  5. Step 5: Solve for x
    x = 376,911.01/644.73
  6. Step 6: Final answer
    x = 584.60

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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.