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Finding the Fourth Proportional to 874.05, 1,311.93 and 728.73

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Solution

The fourth proportional to 874.05, 1,311.93 and 728.73 is: 1,093.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.05 : 1,311.93 = 728.73 : x
  2. Step 2: Convert to fraction form
    874.05/1,311.93 = 728.73/x
  3. Step 3: Cross multiply
    874.05x = 1,311.93 × 728.73
  4. Step 4: Simplify right side
    874.05x = 956,045.82
  5. Step 5: Solve for x
    x = 956,045.82/874.05
  6. Step 6: Final answer
    x = 1,093.81

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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.