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Finding the Fourth Proportional to 248.76, 343.98 and 221.40

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Solution

The fourth proportional to 248.76, 343.98 and 221.40 is: 306.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.76 : 343.98 = 221.40 : x
  2. Step 2: Convert to fraction form
    248.76/343.98 = 221.40/x
  3. Step 3: Cross multiply
    248.76x = 343.98 × 221.40
  4. Step 4: Simplify right side
    248.76x = 76,157.17
  5. Step 5: Solve for x
    x = 76,157.17/248.76
  6. Step 6: Final answer
    x = 306.15

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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.