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Finding the Fourth Proportional to 386.54, 580.19 and 262.76

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Solution

The fourth proportional to 386.54, 580.19 and 262.76 is: 394.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.54 : 580.19 = 262.76 : x
  2. Step 2: Convert to fraction form
    386.54/580.19 = 262.76/x
  3. Step 3: Cross multiply
    386.54x = 580.19 × 262.76
  4. Step 4: Simplify right side
    386.54x = 152,450.72
  5. Step 5: Solve for x
    x = 152,450.72/386.54
  6. Step 6: Final answer
    x = 394.40

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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.