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Finding the Fourth Proportional to 245.20, 338.20 and 141.72

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Solution

The fourth proportional to 245.20, 338.20 and 141.72 is: 195.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.20 : 338.20 = 141.72 : x
  2. Step 2: Convert to fraction form
    245.20/338.20 = 141.72/x
  3. Step 3: Cross multiply
    245.20x = 338.20 × 141.72
  4. Step 4: Simplify right side
    245.20x = 47,929.70
  5. Step 5: Solve for x
    x = 47,929.70/245.20
  6. Step 6: Final answer
    x = 195.47

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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.