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Finding the Fourth Proportional to 668.10, 921.96 and 388.33

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Solution

The fourth proportional to 668.10, 921.96 and 388.33 is: 535.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.10 : 921.96 = 388.33 : x
  2. Step 2: Convert to fraction form
    668.10/921.96 = 388.33/x
  3. Step 3: Cross multiply
    668.10x = 921.96 × 388.33
  4. Step 4: Simplify right side
    668.10x = 358,024.73
  5. Step 5: Solve for x
    x = 358,024.73/668.10
  6. Step 6: Final answer
    x = 535.88

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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.