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Finding the Fourth Proportional to 260.10, 390.60 and 169.20

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Solution

The fourth proportional to 260.10, 390.60 and 169.20 is: 254.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.10 : 390.60 = 169.20 : x
  2. Step 2: Convert to fraction form
    260.10/390.60 = 169.20/x
  3. Step 3: Cross multiply
    260.10x = 390.60 × 169.20
  4. Step 4: Simplify right side
    260.10x = 66,089.52
  5. Step 5: Solve for x
    x = 66,089.52/260.10
  6. Step 6: Final answer
    x = 254.09

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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.