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Finding the Fourth Proportional to 668.70, 922.57 and 447.79

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Solution

The fourth proportional to 668.70, 922.57 and 447.79 is: 617.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.70 : 922.57 = 447.79 : x
  2. Step 2: Convert to fraction form
    668.70/922.57 = 447.79/x
  3. Step 3: Cross multiply
    668.70x = 922.57 × 447.79
  4. Step 4: Simplify right side
    668.70x = 413,117.62
  5. Step 5: Solve for x
    x = 413,117.62/668.70
  6. Step 6: Final answer
    x = 617.79

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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.