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Finding the Fourth Proportional to 254.50, 381.44 and 139

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Solution

The fourth proportional to 254.50, 381.44 and 139 is: 208.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.50 : 381.44 = 139 : x
  2. Step 2: Convert to fraction form
    254.50/381.44 = 139/x
  3. Step 3: Cross multiply
    254.50x = 381.44 × 139
  4. Step 4: Simplify right side
    254.50x = 53,020.16
  5. Step 5: Solve for x
    x = 53,020.16/254.50
  6. Step 6: Final answer
    x = 208.33

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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.