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Finding the Fourth Proportional to 300.40, 414.12 and 275.20

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Solution

The fourth proportional to 300.40, 414.12 and 275.20 is: 379.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.40 : 414.12 = 275.20 : x
  2. Step 2: Convert to fraction form
    300.40/414.12 = 275.20/x
  3. Step 3: Cross multiply
    300.40x = 414.12 × 275.20
  4. Step 4: Simplify right side
    300.40x = 113,965.82
  5. Step 5: Solve for x
    x = 113,965.82/300.40
  6. Step 6: Final answer
    x = 379.38

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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.