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Finding the Fourth Proportional to 644.79, 889.73 and 379.19

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Solution

The fourth proportional to 644.79, 889.73 and 379.19 is: 523.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.79 : 889.73 = 379.19 : x
  2. Step 2: Convert to fraction form
    644.79/889.73 = 379.19/x
  3. Step 3: Cross multiply
    644.79x = 889.73 × 379.19
  4. Step 4: Simplify right side
    644.79x = 337,370.37
  5. Step 5: Solve for x
    x = 337,370.37/644.79
  6. Step 6: Final answer
    x = 523.23

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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.