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Finding the Fourth Proportional to 25.36, 37.86 and 21.31

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Solution

The fourth proportional to 25.36, 37.86 and 21.31 is: 31.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.36 : 37.86 = 21.31 : x
  2. Step 2: Convert to fraction form
    25.36/37.86 = 21.31/x
  3. Step 3: Cross multiply
    25.36x = 37.86 × 21.31
  4. Step 4: Simplify right side
    25.36x = 806.50
  5. Step 5: Solve for x
    x = 806.50/25.36
  6. Step 6: Final answer
    x = 31.81

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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.