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Finding the Fourth Proportional to 644.65, 889.74 and 382.81

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Solution

The fourth proportional to 644.65, 889.74 and 382.81 is: 528.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.65 : 889.74 = 382.81 : x
  2. Step 2: Convert to fraction form
    644.65/889.74 = 382.81/x
  3. Step 3: Cross multiply
    644.65x = 889.74 × 382.81
  4. Step 4: Simplify right side
    644.65x = 340,601.37
  5. Step 5: Solve for x
    x = 340,601.37/644.65
  6. Step 6: Final answer
    x = 528.35

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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.