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Finding the Fourth Proportional to 644.58, 889.74 and 395.91

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Solution

The fourth proportional to 644.58, 889.74 and 395.91 is: 546.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.58 : 889.74 = 395.91 : x
  2. Step 2: Convert to fraction form
    644.58/889.74 = 395.91/x
  3. Step 3: Cross multiply
    644.58x = 889.74 × 395.91
  4. Step 4: Simplify right side
    644.58x = 352,256.96
  5. Step 5: Solve for x
    x = 352,256.96/644.58
  6. Step 6: Final answer
    x = 546.49

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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.