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Finding the Fourth Proportional to 996.98, 1,376.64 and 891.88

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Solution

The fourth proportional to 996.98, 1,376.64 and 891.88 is: 1,231.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.98 : 1,376.64 = 891.88 : x
  2. Step 2: Convert to fraction form
    996.98/1,376.64 = 891.88/x
  3. Step 3: Cross multiply
    996.98x = 1,376.64 × 891.88
  4. Step 4: Simplify right side
    996.98x = 1,227,795.45
  5. Step 5: Solve for x
    x = 1,227,795.45/996.98
  6. Step 6: Final answer
    x = 1,231.52

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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.