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Finding the Fourth Proportional to 260.40, 389.02 and 196.40

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Solution

The fourth proportional to 260.40, 389.02 and 196.40 is: 293.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.40 : 389.02 = 196.40 : x
  2. Step 2: Convert to fraction form
    260.40/389.02 = 196.40/x
  3. Step 3: Cross multiply
    260.40x = 389.02 × 196.40
  4. Step 4: Simplify right side
    260.40x = 76,403.53
  5. Step 5: Solve for x
    x = 76,403.53/260.40
  6. Step 6: Final answer
    x = 293.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.