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Finding the Fourth Proportional to 260.27, 390.74 and 219.99

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Solution

The fourth proportional to 260.27, 390.74 and 219.99 is: 330.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.27 : 390.74 = 219.99 : x
  2. Step 2: Convert to fraction form
    260.27/390.74 = 219.99/x
  3. Step 3: Cross multiply
    260.27x = 390.74 × 219.99
  4. Step 4: Simplify right side
    260.27x = 85,957.79
  5. Step 5: Solve for x
    x = 85,957.79/260.27
  6. Step 6: Final answer
    x = 330.27

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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.