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Finding the Fourth Proportional to 486.15, 670.89 and 276.33

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Solution

The fourth proportional to 486.15, 670.89 and 276.33 is: 381.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.15 : 670.89 = 276.33 : x
  2. Step 2: Convert to fraction form
    486.15/670.89 = 276.33/x
  3. Step 3: Cross multiply
    486.15x = 670.89 × 276.33
  4. Step 4: Simplify right side
    486.15x = 185,383.68
  5. Step 5: Solve for x
    x = 185,383.68/486.15
  6. Step 6: Final answer
    x = 381.33

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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.