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Finding the Fourth Proportional to 248.91, 343.50 and 138.39

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Solution

The fourth proportional to 248.91, 343.50 and 138.39 is: 190.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.91 : 343.50 = 138.39 : x
  2. Step 2: Convert to fraction form
    248.91/343.50 = 138.39/x
  3. Step 3: Cross multiply
    248.91x = 343.50 × 138.39
  4. Step 4: Simplify right side
    248.91x = 47,536.46
  5. Step 5: Solve for x
    x = 47,536.46/248.91
  6. Step 6: Final answer
    x = 190.98

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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.