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Finding the Fourth Proportional to 248.45, 342.78 and 148.85

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Solution

The fourth proportional to 248.45, 342.78 and 148.85 is: 205.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.45 : 342.78 = 148.85 : x
  2. Step 2: Convert to fraction form
    248.45/342.78 = 148.85/x
  3. Step 3: Cross multiply
    248.45x = 342.78 × 148.85
  4. Step 4: Simplify right side
    248.45x = 51,021.09
  5. Step 5: Solve for x
    x = 51,021.09/248.45
  6. Step 6: Final answer
    x = 205.36

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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.