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Finding the Fourth Proportional to 664.48, 917.34 and 443.76

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Solution

The fourth proportional to 664.48, 917.34 and 443.76 is: 612.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.48 : 917.34 = 443.76 : x
  2. Step 2: Convert to fraction form
    664.48/917.34 = 443.76/x
  3. Step 3: Cross multiply
    664.48x = 917.34 × 443.76
  4. Step 4: Simplify right side
    664.48x = 407,078.80
  5. Step 5: Solve for x
    x = 407,078.80/664.48
  6. Step 6: Final answer
    x = 612.63

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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.