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Finding the Fourth Proportional to 997.33, 1,376.13 and 571.90

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Solution

The fourth proportional to 997.33, 1,376.13 and 571.90 is: 789.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.33 : 1,376.13 = 571.90 : x
  2. Step 2: Convert to fraction form
    997.33/1,376.13 = 571.90/x
  3. Step 3: Cross multiply
    997.33x = 1,376.13 × 571.90
  4. Step 4: Simplify right side
    997.33x = 787,008.75
  5. Step 5: Solve for x
    x = 787,008.75/997.33
  6. Step 6: Final answer
    x = 789.12

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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.