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Finding the Fourth Proportional to 997.29, 1,376.33 and 660.62

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Solution

The fourth proportional to 997.29, 1,376.33 and 660.62 is: 911.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.29 : 1,376.33 = 660.62 : x
  2. Step 2: Convert to fraction form
    997.29/1,376.33 = 660.62/x
  3. Step 3: Cross multiply
    997.29x = 1,376.33 × 660.62
  4. Step 4: Simplify right side
    997.29x = 909,220.94
  5. Step 5: Solve for x
    x = 909,220.94/997.29
  6. Step 6: Final answer
    x = 911.69

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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.