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Finding the Fourth Proportional to 309.36, 427.10 and 251.85

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Solution

The fourth proportional to 309.36, 427.10 and 251.85 is: 347.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.36 : 427.10 = 251.85 : x
  2. Step 2: Convert to fraction form
    309.36/427.10 = 251.85/x
  3. Step 3: Cross multiply
    309.36x = 427.10 × 251.85
  4. Step 4: Simplify right side
    309.36x = 107,563.88
  5. Step 5: Solve for x
    x = 107,563.88/309.36
  6. Step 6: Final answer
    x = 347.70

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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.