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Finding the Fourth Proportional to 905.82, 1,357.25 and 871.67

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Solution

The fourth proportional to 905.82, 1,357.25 and 871.67 is: 1,306.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.82 : 1,357.25 = 871.67 : x
  2. Step 2: Convert to fraction form
    905.82/1,357.25 = 871.67/x
  3. Step 3: Cross multiply
    905.82x = 1,357.25 × 871.67
  4. Step 4: Simplify right side
    905.82x = 1,183,062.96
  5. Step 5: Solve for x
    x = 1,183,062.96/905.82
  6. Step 6: Final answer
    x = 1,306.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.