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Finding the Fourth Proportional to 260.95, 389.30 and 239.79

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Solution

The fourth proportional to 260.95, 389.30 and 239.79 is: 357.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.95 : 389.30 = 239.79 : x
  2. Step 2: Convert to fraction form
    260.95/389.30 = 239.79/x
  3. Step 3: Cross multiply
    260.95x = 389.30 × 239.79
  4. Step 4: Simplify right side
    260.95x = 93,348.30
  5. Step 5: Solve for x
    x = 93,348.30/260.95
  6. Step 6: Final answer
    x = 357.72

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.