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Finding the Fourth Proportional to 25.81, 35.61 and 20.00

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Solution

The fourth proportional to 25.81, 35.61 and 20.00 is: 27.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.81 : 35.61 = 20.00 : x
  2. Step 2: Convert to fraction form
    25.81/35.61 = 20.00/x
  3. Step 3: Cross multiply
    25.81x = 35.61 × 20.00
  4. Step 4: Simplify right side
    25.81x = 711.92
  5. Step 5: Solve for x
    x = 711.92/25.81
  6. Step 6: Final answer
    x = 27.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.