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Finding the Fourth Proportional to 644.43, 889.31 and 349.70

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Solution

The fourth proportional to 644.43, 889.31 and 349.70 is: 482.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.43 : 889.31 = 349.70 : x
  2. Step 2: Convert to fraction form
    644.43/889.31 = 349.70/x
  3. Step 3: Cross multiply
    644.43x = 889.31 × 349.70
  4. Step 4: Simplify right side
    644.43x = 310,988.13
  5. Step 5: Solve for x
    x = 310,988.13/644.43
  6. Step 6: Final answer
    x = 482.58

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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.