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Finding the Fourth Proportional to 997.73, 1,376.82 and 578.12

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Solution

The fourth proportional to 997.73, 1,376.82 and 578.12 is: 797.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.73 : 1,376.82 = 578.12 : x
  2. Step 2: Convert to fraction form
    997.73/1,376.82 = 578.12/x
  3. Step 3: Cross multiply
    997.73x = 1,376.82 × 578.12
  4. Step 4: Simplify right side
    997.73x = 795,967.18
  5. Step 5: Solve for x
    x = 795,967.18/997.73
  6. Step 6: Final answer
    x = 797.78

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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.