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Finding the Fourth Proportional to 245.09, 338.26 and 138.76

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Solution

The fourth proportional to 245.09, 338.26 and 138.76 is: 191.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.09 : 338.26 = 138.76 : x
  2. Step 2: Convert to fraction form
    245.09/338.26 = 138.76/x
  3. Step 3: Cross multiply
    245.09x = 338.26 × 138.76
  4. Step 4: Simplify right side
    245.09x = 46,937.93
  5. Step 5: Solve for x
    x = 46,937.93/245.09
  6. Step 6: Final answer
    x = 191.51

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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.