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Finding the Fourth Proportional to 664.86, 917.55 and 440.41

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Solution

The fourth proportional to 664.86, 917.55 and 440.41 is: 607.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.86 : 917.55 = 440.41 : x
  2. Step 2: Convert to fraction form
    664.86/917.55 = 440.41/x
  3. Step 3: Cross multiply
    664.86x = 917.55 × 440.41
  4. Step 4: Simplify right side
    664.86x = 404,098.20
  5. Step 5: Solve for x
    x = 404,098.20/664.86
  6. Step 6: Final answer
    x = 607.79

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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.