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Finding the Fourth Proportional to 398.89, 550.65 and 300.68

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Solution

The fourth proportional to 398.89, 550.65 and 300.68 is: 415.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.89 : 550.65 = 300.68 : x
  2. Step 2: Convert to fraction form
    398.89/550.65 = 300.68/x
  3. Step 3: Cross multiply
    398.89x = 550.65 × 300.68
  4. Step 4: Simplify right side
    398.89x = 165,568.19
  5. Step 5: Solve for x
    x = 165,568.19/398.89
  6. Step 6: Final answer
    x = 415.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.