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Finding the Fourth Proportional to 668.53, 921.36 and 622.36

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Solution

The fourth proportional to 668.53, 921.36 and 622.36 is: 857.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.53 : 921.36 = 622.36 : x
  2. Step 2: Convert to fraction form
    668.53/921.36 = 622.36/x
  3. Step 3: Cross multiply
    668.53x = 921.36 × 622.36
  4. Step 4: Simplify right side
    668.53x = 573,417.61
  5. Step 5: Solve for x
    x = 573,417.61/668.53
  6. Step 6: Final answer
    x = 857.73

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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.