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Finding the Fourth Proportional to 260.91, 390.96 and 169.65

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Solution

The fourth proportional to 260.91, 390.96 and 169.65 is: 254.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.91 : 390.96 = 169.65 : x
  2. Step 2: Convert to fraction form
    260.91/390.96 = 169.65/x
  3. Step 3: Cross multiply
    260.91x = 390.96 × 169.65
  4. Step 4: Simplify right side
    260.91x = 66,326.36
  5. Step 5: Solve for x
    x = 66,326.36/260.91
  6. Step 6: Final answer
    x = 254.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.