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Finding the Fourth Proportional to 300.78, 415.13 and 218.16

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Solution

The fourth proportional to 300.78, 415.13 and 218.16 is: 301.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.78 : 415.13 = 218.16 : x
  2. Step 2: Convert to fraction form
    300.78/415.13 = 218.16/x
  3. Step 3: Cross multiply
    300.78x = 415.13 × 218.16
  4. Step 4: Simplify right side
    300.78x = 90,563.67
  5. Step 5: Solve for x
    x = 90,563.67/300.78
  6. Step 6: Final answer
    x = 301.10

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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.