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Finding the Fourth Proportional to 309.88, 427.11 and 283.73

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Solution

The fourth proportional to 309.88, 427.11 and 283.73 is: 391.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.88 : 427.11 = 283.73 : x
  2. Step 2: Convert to fraction form
    309.88/427.11 = 283.73/x
  3. Step 3: Cross multiply
    309.88x = 427.11 × 283.73
  4. Step 4: Simplify right side
    309.88x = 121,183.92
  5. Step 5: Solve for x
    x = 121,183.92/309.88
  6. Step 6: Final answer
    x = 391.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.