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Finding the Fourth Proportional to 644.56, 889.68 and 396

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Solution

The fourth proportional to 644.56, 889.68 and 396 is: 546.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.56 : 889.68 = 396 : x
  2. Step 2: Convert to fraction form
    644.56/889.68 = 396/x
  3. Step 3: Cross multiply
    644.56x = 889.68 × 396
  4. Step 4: Simplify right side
    644.56x = 352,313.28
  5. Step 5: Solve for x
    x = 352,313.28/644.56
  6. Step 6: Final answer
    x = 546.60

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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.