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Finding the Fourth Proportional to 283.93, 391.57 and 221.56

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Solution

The fourth proportional to 283.93, 391.57 and 221.56 is: 305.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.93 : 391.57 = 221.56 : x
  2. Step 2: Convert to fraction form
    283.93/391.57 = 221.56/x
  3. Step 3: Cross multiply
    283.93x = 391.57 × 221.56
  4. Step 4: Simplify right side
    283.93x = 86,754.72
  5. Step 5: Solve for x
    x = 86,754.72/283.93
  6. Step 6: Final answer
    x = 305.55

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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.