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Finding the Fourth Proportional to 248.40, 342.20 and 235.20

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Solution

The fourth proportional to 248.40, 342.20 and 235.20 is: 324.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.40 : 342.20 = 235.20 : x
  2. Step 2: Convert to fraction form
    248.40/342.20 = 235.20/x
  3. Step 3: Cross multiply
    248.40x = 342.20 × 235.20
  4. Step 4: Simplify right side
    248.40x = 80,485.44
  5. Step 5: Solve for x
    x = 80,485.44/248.40
  6. Step 6: Final answer
    x = 324.02

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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.