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Finding the Fourth Proportional to 25.75, 38.63 and 12.91

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Solution

The fourth proportional to 25.75, 38.63 and 12.91 is: 19.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.75 : 38.63 = 12.91 : x
  2. Step 2: Convert to fraction form
    25.75/38.63 = 12.91/x
  3. Step 3: Cross multiply
    25.75x = 38.63 × 12.91
  4. Step 4: Simplify right side
    25.75x = 498.71
  5. Step 5: Solve for x
    x = 498.71/25.75
  6. Step 6: Final answer
    x = 19.37

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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.