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Finding the Fourth Proportional to 668.22, 921.30 and 493.26

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Solution

The fourth proportional to 668.22, 921.30 and 493.26 is: 680.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.22 : 921.30 = 493.26 : x
  2. Step 2: Convert to fraction form
    668.22/921.30 = 493.26/x
  3. Step 3: Cross multiply
    668.22x = 921.30 × 493.26
  4. Step 4: Simplify right side
    668.22x = 454,440.44
  5. Step 5: Solve for x
    x = 454,440.44/668.22
  6. Step 6: Final answer
    x = 680.08

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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.