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Finding the Fourth Proportional to 891.93, 1,231.97 and 631.11

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Solution

The fourth proportional to 891.93, 1,231.97 and 631.11 is: 871.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.93 : 1,231.97 = 631.11 : x
  2. Step 2: Convert to fraction form
    891.93/1,231.97 = 631.11/x
  3. Step 3: Cross multiply
    891.93x = 1,231.97 × 631.11
  4. Step 4: Simplify right side
    891.93x = 777,505.43
  5. Step 5: Solve for x
    x = 777,505.43/891.93
  6. Step 6: Final answer
    x = 871.71

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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.