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Finding the Fourth Proportional to 789.42, 1,183.78 and 302.20

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Solution

The fourth proportional to 789.42, 1,183.78 and 302.20 is: 453.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.42 : 1,183.78 = 302.20 : x
  2. Step 2: Convert to fraction form
    789.42/1,183.78 = 302.20/x
  3. Step 3: Cross multiply
    789.42x = 1,183.78 × 302.20
  4. Step 4: Simplify right side
    789.42x = 357,738.32
  5. Step 5: Solve for x
    x = 357,738.32/789.42
  6. Step 6: Final answer
    x = 453.17

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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.