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Finding the Fourth Proportional to 789.90, 1,184.87 and 212.77

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Solution

The fourth proportional to 789.90, 1,184.87 and 212.77 is: 319.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.90 : 1,184.87 = 212.77 : x
  2. Step 2: Convert to fraction form
    789.90/1,184.87 = 212.77/x
  3. Step 3: Cross multiply
    789.90x = 1,184.87 × 212.77
  4. Step 4: Simplify right side
    789.90x = 252,104.79
  5. Step 5: Solve for x
    x = 252,104.79/789.90
  6. Step 6: Final answer
    x = 319.16

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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.