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Finding the Fourth Proportional to 644.76, 889.89 and 382.93

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Solution

The fourth proportional to 644.76, 889.89 and 382.93 is: 528.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.76 : 889.89 = 382.93 : x
  2. Step 2: Convert to fraction form
    644.76/889.89 = 382.93/x
  3. Step 3: Cross multiply
    644.76x = 889.89 × 382.93
  4. Step 4: Simplify right side
    644.76x = 340,761.92
  5. Step 5: Solve for x
    x = 340,761.92/644.76
  6. Step 6: Final answer
    x = 528.51

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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.