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Finding the Fourth Proportional to 644.45, 889.94 and 469.49

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Solution

The fourth proportional to 644.45, 889.94 and 469.49 is: 648.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.45 : 889.94 = 469.49 : x
  2. Step 2: Convert to fraction form
    644.45/889.94 = 469.49/x
  3. Step 3: Cross multiply
    644.45x = 889.94 × 469.49
  4. Step 4: Simplify right side
    644.45x = 417,811.13
  5. Step 5: Solve for x
    x = 417,811.13/644.45
  6. Step 6: Final answer
    x = 648.33

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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.