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Finding the Fourth Proportional to 248.76, 343.28 and 138.24

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Solution

The fourth proportional to 248.76, 343.28 and 138.24 is: 190.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.76 : 343.28 = 138.24 : x
  2. Step 2: Convert to fraction form
    248.76/343.28 = 138.24/x
  3. Step 3: Cross multiply
    248.76x = 343.28 × 138.24
  4. Step 4: Simplify right side
    248.76x = 47,455.03
  5. Step 5: Solve for x
    x = 47,455.03/248.76
  6. Step 6: Final answer
    x = 190.77

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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.