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Finding the Fourth Proportional to 668.03, 921.85 and 388.27

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Solution

The fourth proportional to 668.03, 921.85 and 388.27 is: 535.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.03 : 921.85 = 388.27 : x
  2. Step 2: Convert to fraction form
    668.03/921.85 = 388.27/x
  3. Step 3: Cross multiply
    668.03x = 921.85 × 388.27
  4. Step 4: Simplify right side
    668.03x = 357,923.42
  5. Step 5: Solve for x
    x = 357,923.42/668.03
  6. Step 6: Final answer
    x = 535.79

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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.