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Finding the Fourth Proportional to 997.27, 1,376.81 and 666.79

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Solution

The fourth proportional to 997.27, 1,376.81 and 666.79 is: 920.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.27 : 1,376.81 = 666.79 : x
  2. Step 2: Convert to fraction form
    997.27/1,376.81 = 666.79/x
  3. Step 3: Cross multiply
    997.27x = 1,376.81 × 666.79
  4. Step 4: Simplify right side
    997.27x = 918,043.14
  5. Step 5: Solve for x
    x = 918,043.14/997.27
  6. Step 6: Final answer
    x = 920.56

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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.