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Finding the Fourth Proportional to 644.83, 889.56 and 408.61

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Solution

The fourth proportional to 644.83, 889.56 and 408.61 is: 563.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.83 : 889.56 = 408.61 : x
  2. Step 2: Convert to fraction form
    644.83/889.56 = 408.61/x
  3. Step 3: Cross multiply
    644.83x = 889.56 × 408.61
  4. Step 4: Simplify right side
    644.83x = 363,484.22
  5. Step 5: Solve for x
    x = 363,484.22/644.83
  6. Step 6: Final answer
    x = 563.69

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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.