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Finding the Fourth Proportional to 386.80, 579.81 and 181.23

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Solution

The fourth proportional to 386.80, 579.81 and 181.23 is: 271.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.80 : 579.81 = 181.23 : x
  2. Step 2: Convert to fraction form
    386.80/579.81 = 181.23/x
  3. Step 3: Cross multiply
    386.80x = 579.81 × 181.23
  4. Step 4: Simplify right side
    386.80x = 105,078.97
  5. Step 5: Solve for x
    x = 105,078.97/386.80
  6. Step 6: Final answer
    x = 271.66

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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.