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Finding the Fourth Proportional to 668.56, 921.20 and 622.38

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Solution

The fourth proportional to 668.56, 921.20 and 622.38 is: 857.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.56 : 921.20 = 622.38 : x
  2. Step 2: Convert to fraction form
    668.56/921.20 = 622.38/x
  3. Step 3: Cross multiply
    668.56x = 921.20 × 622.38
  4. Step 4: Simplify right side
    668.56x = 573,336.46
  5. Step 5: Solve for x
    x = 573,336.46/668.56
  6. Step 6: Final answer
    x = 857.57

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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.