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Finding the Fourth Proportional to 664.70, 917.06 and 443.79

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Solution

The fourth proportional to 664.70, 917.06 and 443.79 is: 612.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.70 : 917.06 = 443.79 : x
  2. Step 2: Convert to fraction form
    664.70/917.06 = 443.79/x
  3. Step 3: Cross multiply
    664.70x = 917.06 × 443.79
  4. Step 4: Simplify right side
    664.70x = 406,979.84
  5. Step 5: Solve for x
    x = 406,979.84/664.70
  6. Step 6: Final answer
    x = 612.28

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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.