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Finding the Fourth Proportional to 644.86, 889.76 and 379.28

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Solution

The fourth proportional to 644.86, 889.76 and 379.28 is: 523.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.86 : 889.76 = 379.28 : x
  2. Step 2: Convert to fraction form
    644.86/889.76 = 379.28/x
  3. Step 3: Cross multiply
    644.86x = 889.76 × 379.28
  4. Step 4: Simplify right side
    644.86x = 337,468.17
  5. Step 5: Solve for x
    x = 337,468.17/644.86
  6. Step 6: Final answer
    x = 523.32

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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.