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Finding the Fourth Proportional to 25.98, 39 and 19.60

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Solution

The fourth proportional to 25.98, 39 and 19.60 is: 29.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.98 : 39 = 19.60 : x
  2. Step 2: Convert to fraction form
    25.98/39 = 19.60/x
  3. Step 3: Cross multiply
    25.98x = 39 × 19.60
  4. Step 4: Simplify right side
    25.98x = 764.40
  5. Step 5: Solve for x
    x = 764.40/25.98
  6. Step 6: Final answer
    x = 29.42

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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.