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Finding the Fourth Proportional to 722.75, 997.67 and 668.21

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Solution

The fourth proportional to 722.75, 997.67 and 668.21 is: 922.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.75 : 997.67 = 668.21 : x
  2. Step 2: Convert to fraction form
    722.75/997.67 = 668.21/x
  3. Step 3: Cross multiply
    722.75x = 997.67 × 668.21
  4. Step 4: Simplify right side
    722.75x = 666,649.73
  5. Step 5: Solve for x
    x = 666,649.73/722.75
  6. Step 6: Final answer
    x = 922.38

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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.