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Finding the Fourth Proportional to 253.76, 381.48 and 199.28

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Solution

The fourth proportional to 253.76, 381.48 and 199.28 is: 299.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.76 : 381.48 = 199.28 : x
  2. Step 2: Convert to fraction form
    253.76/381.48 = 199.28/x
  3. Step 3: Cross multiply
    253.76x = 381.48 × 199.28
  4. Step 4: Simplify right side
    253.76x = 76,021.33
  5. Step 5: Solve for x
    x = 76,021.33/253.76
  6. Step 6: Final answer
    x = 299.58

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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.