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Finding the Fourth Proportional to 668.68, 921.54 and 493.96

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Solution

The fourth proportional to 668.68, 921.54 and 493.96 is: 680.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.68 : 921.54 = 493.96 : x
  2. Step 2: Convert to fraction form
    668.68/921.54 = 493.96/x
  3. Step 3: Cross multiply
    668.68x = 921.54 × 493.96
  4. Step 4: Simplify right side
    668.68x = 455,203.90
  5. Step 5: Solve for x
    x = 455,203.90/668.68
  6. Step 6: Final answer
    x = 680.75

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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.