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Finding the Fourth Proportional to 248.68, 340.21 and 247.64

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Solution

The fourth proportional to 248.68, 340.21 and 247.64 is: 338.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.68 : 340.21 = 247.64 : x
  2. Step 2: Convert to fraction form
    248.68/340.21 = 247.64/x
  3. Step 3: Cross multiply
    248.68x = 340.21 × 247.64
  4. Step 4: Simplify right side
    248.68x = 84,249.60
  5. Step 5: Solve for x
    x = 84,249.60/248.68
  6. Step 6: Final answer
    x = 338.79

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.