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Finding the Fourth Proportional to 309.58, 427.29 and 216.22

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Solution

The fourth proportional to 309.58, 427.29 and 216.22 is: 298.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.58 : 427.29 = 216.22 : x
  2. Step 2: Convert to fraction form
    309.58/427.29 = 216.22/x
  3. Step 3: Cross multiply
    309.58x = 427.29 × 216.22
  4. Step 4: Simplify right side
    309.58x = 92,388.64
  5. Step 5: Solve for x
    x = 92,388.64/309.58
  6. Step 6: Final answer
    x = 298.43

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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.