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Finding the Fourth Proportional to 248.28, 342.38 and 220.95

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Solution

The fourth proportional to 248.28, 342.38 and 220.95 is: 304.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.28 : 342.38 = 220.95 : x
  2. Step 2: Convert to fraction form
    248.28/342.38 = 220.95/x
  3. Step 3: Cross multiply
    248.28x = 342.38 × 220.95
  4. Step 4: Simplify right side
    248.28x = 75,647.76
  5. Step 5: Solve for x
    x = 75,647.76/248.28
  6. Step 6: Final answer
    x = 304.69

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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.