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Finding the Fourth Proportional to 644.63, 889.30 and 395.85

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Solution

The fourth proportional to 644.63, 889.30 and 395.85 is: 546.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.63 : 889.30 = 395.85 : x
  2. Step 2: Convert to fraction form
    644.63/889.30 = 395.85/x
  3. Step 3: Cross multiply
    644.63x = 889.30 × 395.85
  4. Step 4: Simplify right side
    644.63x = 352,029.41
  5. Step 5: Solve for x
    x = 352,029.41/644.63
  6. Step 6: Final answer
    x = 546.10

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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.