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Finding the Fourth Proportional to 386.85, 580.10 and 181.52

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Solution

The fourth proportional to 386.85, 580.10 and 181.52 is: 272.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.85 : 580.10 = 181.52 : x
  2. Step 2: Convert to fraction form
    386.85/580.10 = 181.52/x
  3. Step 3: Cross multiply
    386.85x = 580.10 × 181.52
  4. Step 4: Simplify right side
    386.85x = 105,295.94
  5. Step 5: Solve for x
    x = 105,295.94/386.85
  6. Step 6: Final answer
    x = 272.19

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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.