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Finding the Fourth Proportional to 679.04, 937.92 and 668.80

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Solution

The fourth proportional to 679.04, 937.92 and 668.80 is: 923.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.04 : 937.92 = 668.80 : x
  2. Step 2: Convert to fraction form
    679.04/937.92 = 668.80/x
  3. Step 3: Cross multiply
    679.04x = 937.92 × 668.80
  4. Step 4: Simplify right side
    679.04x = 627,280.90
  5. Step 5: Solve for x
    x = 627,280.90/679.04
  6. Step 6: Final answer
    x = 923.78

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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.