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Finding the Fourth Proportional to 644.26, 889.15 and 395.49

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Solution

The fourth proportional to 644.26, 889.15 and 395.49 is: 545.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.26 : 889.15 = 395.49 : x
  2. Step 2: Convert to fraction form
    644.26/889.15 = 395.49/x
  3. Step 3: Cross multiply
    644.26x = 889.15 × 395.49
  4. Step 4: Simplify right side
    644.26x = 351,649.93
  5. Step 5: Solve for x
    x = 351,649.93/644.26
  6. Step 6: Final answer
    x = 545.82

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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.