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Finding the Fourth Proportional to 300.98, 415.28 and 218.28

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Solution

The fourth proportional to 300.98, 415.28 and 218.28 is: 301.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.98 : 415.28 = 218.28 : x
  2. Step 2: Convert to fraction form
    300.98/415.28 = 218.28/x
  3. Step 3: Cross multiply
    300.98x = 415.28 × 218.28
  4. Step 4: Simplify right side
    300.98x = 90,647.32
  5. Step 5: Solve for x
    x = 90,647.32/300.98
  6. Step 6: Final answer
    x = 301.17

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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.