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Finding the Fourth Proportional to 997.66, 1,376.78 and 555.56

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Solution

The fourth proportional to 997.66, 1,376.78 and 555.56 is: 766.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.66 : 1,376.78 = 555.56 : x
  2. Step 2: Convert to fraction form
    997.66/1,376.78 = 555.56/x
  3. Step 3: Cross multiply
    997.66x = 1,376.78 × 555.56
  4. Step 4: Simplify right side
    997.66x = 764,883.90
  5. Step 5: Solve for x
    x = 764,883.90/997.66
  6. Step 6: Final answer
    x = 766.68

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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.