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Finding the Fourth Proportional to 644.49, 889.40 and 395.94

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Solution

The fourth proportional to 644.49, 889.40 and 395.94 is: 546.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.49 : 889.40 = 395.94 : x
  2. Step 2: Convert to fraction form
    644.49/889.40 = 395.94/x
  3. Step 3: Cross multiply
    644.49x = 889.40 × 395.94
  4. Step 4: Simplify right side
    644.49x = 352,149.04
  5. Step 5: Solve for x
    x = 352,149.04/644.49
  6. Step 6: Final answer
    x = 546.40

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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.