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Finding the Fourth Proportional to 874.74, 1,212.21 and 858.30

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Solution

The fourth proportional to 874.74, 1,212.21 and 858.30 is: 1,189.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.74 : 1,212.21 = 858.30 : x
  2. Step 2: Convert to fraction form
    874.74/1,212.21 = 858.30/x
  3. Step 3: Cross multiply
    874.74x = 1,212.21 × 858.30
  4. Step 4: Simplify right side
    874.74x = 1,040,439.84
  5. Step 5: Solve for x
    x = 1,040,439.84/874.74
  6. Step 6: Final answer
    x = 1,189.43

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.