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Finding the Fourth Proportional to 386.21, 579.59 and 299.75

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Solution

The fourth proportional to 386.21, 579.59 and 299.75 is: 449.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.21 : 579.59 = 299.75 : x
  2. Step 2: Convert to fraction form
    386.21/579.59 = 299.75/x
  3. Step 3: Cross multiply
    386.21x = 579.59 × 299.75
  4. Step 4: Simplify right side
    386.21x = 173,727.71
  5. Step 5: Solve for x
    x = 173,727.71/386.21
  6. Step 6: Final answer
    x = 449.83

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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.