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Finding the Fourth Proportional to 679.56, 939.77 and 667.26

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Solution

The fourth proportional to 679.56, 939.77 and 667.26 is: 922.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.56 : 939.77 = 667.26 : x
  2. Step 2: Convert to fraction form
    679.56/939.77 = 667.26/x
  3. Step 3: Cross multiply
    679.56x = 939.77 × 667.26
  4. Step 4: Simplify right side
    679.56x = 627,070.93
  5. Step 5: Solve for x
    x = 627,070.93/679.56
  6. Step 6: Final answer
    x = 922.76

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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.