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Finding the Fourth Proportional to 789.55, 1,184.31 and 212.42

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Solution

The fourth proportional to 789.55, 1,184.31 and 212.42 is: 318.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.55 : 1,184.31 = 212.42 : x
  2. Step 2: Convert to fraction form
    789.55/1,184.31 = 212.42/x
  3. Step 3: Cross multiply
    789.55x = 1,184.31 × 212.42
  4. Step 4: Simplify right side
    789.55x = 251,571.66
  5. Step 5: Solve for x
    x = 251,571.66/789.55
  6. Step 6: Final answer
    x = 318.63

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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.