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Finding the Fourth Proportional to 245.21, 338.40 and 140.31

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Solution

The fourth proportional to 245.21, 338.40 and 140.31 is: 193.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.21 : 338.40 = 140.31 : x
  2. Step 2: Convert to fraction form
    245.21/338.40 = 140.31/x
  3. Step 3: Cross multiply
    245.21x = 338.40 × 140.31
  4. Step 4: Simplify right side
    245.21x = 47,480.90
  5. Step 5: Solve for x
    x = 47,480.90/245.21
  6. Step 6: Final answer
    x = 193.64

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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.