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Finding the Fourth Proportional to 874.56, 1,311.21 and 412.11

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Solution

The fourth proportional to 874.56, 1,311.21 and 412.11 is: 617.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.56 : 1,311.21 = 412.11 : x
  2. Step 2: Convert to fraction form
    874.56/1,311.21 = 412.11/x
  3. Step 3: Cross multiply
    874.56x = 1,311.21 × 412.11
  4. Step 4: Simplify right side
    874.56x = 540,362.75
  5. Step 5: Solve for x
    x = 540,362.75/874.56
  6. Step 6: Final answer
    x = 617.87

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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.