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Finding the Fourth Proportional to 310.15, 427.78 and 240.42

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Solution

The fourth proportional to 310.15, 427.78 and 240.42 is: 331.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.15 : 427.78 = 240.42 : x
  2. Step 2: Convert to fraction form
    310.15/427.78 = 240.42/x
  3. Step 3: Cross multiply
    310.15x = 427.78 × 240.42
  4. Step 4: Simplify right side
    310.15x = 102,846.37
  5. Step 5: Solve for x
    x = 102,846.37/310.15
  6. Step 6: Final answer
    x = 331.60

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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.