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Finding the Fourth Proportional to 664.49, 917.37 and 516.80

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Solution

The fourth proportional to 664.49, 917.37 and 516.80 is: 713.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.49 : 917.37 = 516.80 : x
  2. Step 2: Convert to fraction form
    664.49/917.37 = 516.80/x
  3. Step 3: Cross multiply
    664.49x = 917.37 × 516.80
  4. Step 4: Simplify right side
    664.49x = 474,092.23
  5. Step 5: Solve for x
    x = 474,092.23/664.49
  6. Step 6: Final answer
    x = 713.47

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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.