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Finding the Fourth Proportional to 668.25, 921.17 and 574.49

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Solution

The fourth proportional to 668.25, 921.17 and 574.49 is: 791.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.25 : 921.17 = 574.49 : x
  2. Step 2: Convert to fraction form
    668.25/921.17 = 574.49/x
  3. Step 3: Cross multiply
    668.25x = 921.17 × 574.49
  4. Step 4: Simplify right side
    668.25x = 529,206.69
  5. Step 5: Solve for x
    x = 529,206.69/668.25
  6. Step 6: Final answer
    x = 791.93

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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.