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Finding the Fourth Proportional to 248.99, 343.58 and 138.45

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Solution

The fourth proportional to 248.99, 343.58 and 138.45 is: 191.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    248.99 : 343.58 = 138.45 : x
  2. Step 2: Convert to fraction form
    248.99/343.58 = 138.45/x
  3. Step 3: Cross multiply
    248.99x = 343.58 × 138.45
  4. Step 4: Simplify right side
    248.99x = 47,567.96
  5. Step 5: Solve for x
    x = 47,567.96/248.99
  6. Step 6: Final answer
    x = 191.05

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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.