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Finding the Fourth Proportional to 245.21, 338.76 and 243.39

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Solution

The fourth proportional to 245.21, 338.76 and 243.39 is: 336.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.21 : 338.76 = 243.39 : x
  2. Step 2: Convert to fraction form
    245.21/338.76 = 243.39/x
  3. Step 3: Cross multiply
    245.21x = 338.76 × 243.39
  4. Step 4: Simplify right side
    245.21x = 82,450.80
  5. Step 5: Solve for x
    x = 82,450.80/245.21
  6. Step 6: Final answer
    x = 336.25

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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.