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Finding the Fourth Proportional to 260.99, 391.56 and 98.68

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Solution

The fourth proportional to 260.99, 391.56 and 98.68 is: 148.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.99 : 391.56 = 98.68 : x
  2. Step 2: Convert to fraction form
    260.99/391.56 = 98.68/x
  3. Step 3: Cross multiply
    260.99x = 391.56 × 98.68
  4. Step 4: Simplify right side
    260.99x = 38,637.79
  5. Step 5: Solve for x
    x = 38,637.79/260.99
  6. Step 6: Final answer
    x = 148.04

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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.