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Finding the Fourth Proportional to 300.96, 412.79 and 278.28

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Solution

The fourth proportional to 300.96, 412.79 and 278.28 is: 381.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.96 : 412.79 = 278.28 : x
  2. Step 2: Convert to fraction form
    300.96/412.79 = 278.28/x
  3. Step 3: Cross multiply
    300.96x = 412.79 × 278.28
  4. Step 4: Simplify right side
    300.96x = 114,869.81
  5. Step 5: Solve for x
    x = 114,869.81/300.96
  6. Step 6: Final answer
    x = 381.68

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.