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Finding the Fourth Proportional to 253.98, 381.04 and 107.79

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Solution

The fourth proportional to 253.98, 381.04 and 107.79 is: 161.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.98 : 381.04 = 107.79 : x
  2. Step 2: Convert to fraction form
    253.98/381.04 = 107.79/x
  3. Step 3: Cross multiply
    253.98x = 381.04 × 107.79
  4. Step 4: Simplify right side
    253.98x = 41,071.76
  5. Step 5: Solve for x
    x = 41,071.76/253.98
  6. Step 6: Final answer
    x = 161.72

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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.