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Finding the Fourth Proportional to 309.88, 427.66 and 193.56

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Solution

The fourth proportional to 309.88, 427.66 and 193.56 is: 267.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.88 : 427.66 = 193.56 : x
  2. Step 2: Convert to fraction form
    309.88/427.66 = 193.56/x
  3. Step 3: Cross multiply
    309.88x = 427.66 × 193.56
  4. Step 4: Simplify right side
    309.88x = 82,777.87
  5. Step 5: Solve for x
    x = 82,777.87/309.88
  6. Step 6: Final answer
    x = 267.13

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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.