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Finding the Fourth Proportional to 668.25, 921.78 and 447.12

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Solution

The fourth proportional to 668.25, 921.78 and 447.12 is: 616.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.25 : 921.78 = 447.12 : x
  2. Step 2: Convert to fraction form
    668.25/921.78 = 447.12/x
  3. Step 3: Cross multiply
    668.25x = 921.78 × 447.12
  4. Step 4: Simplify right side
    668.25x = 412,146.27
  5. Step 5: Solve for x
    x = 412,146.27/668.25
  6. Step 6: Final answer
    x = 616.75

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1.5x scale

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.