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Finding the Fourth Proportional to 644.63, 889.59 and 382.69

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Solution

The fourth proportional to 644.63, 889.59 and 382.69 is: 528.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.63 : 889.59 = 382.69 : x
  2. Step 2: Convert to fraction form
    644.63/889.59 = 382.69/x
  3. Step 3: Cross multiply
    644.63x = 889.59 × 382.69
  4. Step 4: Simplify right side
    644.63x = 340,437.20
  5. Step 5: Solve for x
    x = 340,437.20/644.63
  6. Step 6: Final answer
    x = 528.11

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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.