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Finding the Fourth Proportional to 351.89, 485.96 and 278.74

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Solution

The fourth proportional to 351.89, 485.96 and 278.74 is: 384.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.89 : 485.96 = 278.74 : x
  2. Step 2: Convert to fraction form
    351.89/485.96 = 278.74/x
  3. Step 3: Cross multiply
    351.89x = 485.96 × 278.74
  4. Step 4: Simplify right side
    351.89x = 135,456.49
  5. Step 5: Solve for x
    x = 135,456.49/351.89
  6. Step 6: Final answer
    x = 384.94

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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.