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Finding the Fourth Proportional to 996.77, 1,376.22 and 623.90

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Solution

The fourth proportional to 996.77, 1,376.22 and 623.90 is: 861.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.77 : 1,376.22 = 623.90 : x
  2. Step 2: Convert to fraction form
    996.77/1,376.22 = 623.90/x
  3. Step 3: Cross multiply
    996.77x = 1,376.22 × 623.90
  4. Step 4: Simplify right side
    996.77x = 858,623.66
  5. Step 5: Solve for x
    x = 858,623.66/996.77
  6. Step 6: Final answer
    x = 861.41

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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.