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Finding the Fourth Proportional to 386.95, 580.62 and 213.75

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Solution

The fourth proportional to 386.95, 580.62 and 213.75 is: 320.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.95 : 580.62 = 213.75 : x
  2. Step 2: Convert to fraction form
    386.95/580.62 = 213.75/x
  3. Step 3: Cross multiply
    386.95x = 580.62 × 213.75
  4. Step 4: Simplify right side
    386.95x = 124,107.53
  5. Step 5: Solve for x
    x = 124,107.53/386.95
  6. Step 6: Final answer
    x = 320.73

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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.