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Finding the Fourth Proportional to 25.89, 38.80 and 21.38

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Solution

The fourth proportional to 25.89, 38.80 and 21.38 is: 32.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.89 : 38.80 = 21.38 : x
  2. Step 2: Convert to fraction form
    25.89/38.80 = 21.38/x
  3. Step 3: Cross multiply
    25.89x = 38.80 × 21.38
  4. Step 4: Simplify right side
    25.89x = 829.49
  5. Step 5: Solve for x
    x = 829.49/25.89
  6. Step 6: Final answer
    x = 32.03

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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.