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Finding the Fourth Proportional to 644.19, 889.48 and 395.62

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Solution

The fourth proportional to 644.19, 889.48 and 395.62 is: 546.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.19 : 889.48 = 395.62 : x
  2. Step 2: Convert to fraction form
    644.19/889.48 = 395.62/x
  3. Step 3: Cross multiply
    644.19x = 889.48 × 395.62
  4. Step 4: Simplify right side
    644.19x = 351,894.35
  5. Step 5: Solve for x
    x = 351,894.35/644.19
  6. Step 6: Final answer
    x = 546.26

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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.