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Finding the Fourth Proportional to 351.78, 485.63 and 272.92

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Solution

The fourth proportional to 351.78, 485.63 and 272.92 is: 376.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.78 : 485.63 = 272.92 : x
  2. Step 2: Convert to fraction form
    351.78/485.63 = 272.92/x
  3. Step 3: Cross multiply
    351.78x = 485.63 × 272.92
  4. Step 4: Simplify right side
    351.78x = 132,538.14
  5. Step 5: Solve for x
    x = 132,538.14/351.78
  6. Step 6: Final answer
    x = 376.76

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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.