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Finding the Fourth Proportional to 644.11, 889.12 and 395.77

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Solution

The fourth proportional to 644.11, 889.12 and 395.77 is: 546.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.11 : 889.12 = 395.77 : x
  2. Step 2: Convert to fraction form
    644.11/889.12 = 395.77/x
  3. Step 3: Cross multiply
    644.11x = 889.12 × 395.77
  4. Step 4: Simplify right side
    644.11x = 351,884.74
  5. Step 5: Solve for x
    x = 351,884.74/644.11
  6. Step 6: Final answer
    x = 546.31

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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.