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Finding the Fourth Proportional to 979, 1,351.74 and 667.96

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Solution

The fourth proportional to 979, 1,351.74 and 667.96 is: 922.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    979 : 1,351.74 = 667.96 : x
  2. Step 2: Convert to fraction form
    979/1,351.74 = 667.96/x
  3. Step 3: Cross multiply
    979x = 1,351.74 × 667.96
  4. Step 4: Simplify right side
    979x = 902,908.25
  5. Step 5: Solve for x
    x = 902,908.25/979
  6. Step 6: Final answer
    x = 922.28

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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.