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Finding the Fourth Proportional to 644.70, 889.43 and 455.93

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Solution

The fourth proportional to 644.70, 889.43 and 455.93 is: 628.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.70 : 889.43 = 455.93 : x
  2. Step 2: Convert to fraction form
    644.70/889.43 = 455.93/x
  3. Step 3: Cross multiply
    644.70x = 889.43 × 455.93
  4. Step 4: Simplify right side
    644.70x = 405,511.09
  5. Step 5: Solve for x
    x = 405,511.09/644.70
  6. Step 6: Final answer
    x = 628.99

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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.