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Finding the Fourth Proportional to 260.88, 390.96 and 130.92

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Solution

The fourth proportional to 260.88, 390.96 and 130.92 is: 196.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.88 : 390.96 = 130.92 : x
  2. Step 2: Convert to fraction form
    260.88/390.96 = 130.92/x
  3. Step 3: Cross multiply
    260.88x = 390.96 × 130.92
  4. Step 4: Simplify right side
    260.88x = 51,184.48
  5. Step 5: Solve for x
    x = 51,184.48/260.88
  6. Step 6: Final answer
    x = 196.20

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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.