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Finding the Fourth Proportional to 309.54, 427.30 and 216.42

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Solution

The fourth proportional to 309.54, 427.30 and 216.42 is: 298.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.54 : 427.30 = 216.42 : x
  2. Step 2: Convert to fraction form
    309.54/427.30 = 216.42/x
  3. Step 3: Cross multiply
    309.54x = 427.30 × 216.42
  4. Step 4: Simplify right side
    309.54x = 92,476.27
  5. Step 5: Solve for x
    x = 92,476.27/309.54
  6. Step 6: Final answer
    x = 298.75

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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.