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Finding the Fourth Proportional to 644.33, 889.26 and 423.92

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Solution

The fourth proportional to 644.33, 889.26 and 423.92 is: 585.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.33 : 889.26 = 423.92 : x
  2. Step 2: Convert to fraction form
    644.33/889.26 = 423.92/x
  3. Step 3: Cross multiply
    644.33x = 889.26 × 423.92
  4. Step 4: Simplify right side
    644.33x = 376,970.65
  5. Step 5: Solve for x
    x = 376,970.65/644.33
  6. Step 6: Final answer
    x = 585.06

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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.