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Finding the Fourth Proportional to 25.81, 38.50 and 25.20

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Solution

The fourth proportional to 25.81, 38.50 and 25.20 is: 37.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.81 : 38.50 = 25.20 : x
  2. Step 2: Convert to fraction form
    25.81/38.50 = 25.20/x
  3. Step 3: Cross multiply
    25.81x = 38.50 × 25.20
  4. Step 4: Simplify right side
    25.81x = 970.14
  5. Step 5: Solve for x
    x = 970.14/25.81
  6. Step 6: Final answer
    x = 37.59

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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.