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Finding the Fourth Proportional to 351.77, 485.06 and 239.81

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Solution

The fourth proportional to 351.77, 485.06 and 239.81 is: 330.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.77 : 485.06 = 239.81 : x
  2. Step 2: Convert to fraction form
    351.77/485.06 = 239.81/x
  3. Step 3: Cross multiply
    351.77x = 485.06 × 239.81
  4. Step 4: Simplify right side
    351.77x = 116,324.05
  5. Step 5: Solve for x
    x = 116,324.05/351.77
  6. Step 6: Final answer
    x = 330.68

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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.