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Finding the Fourth Proportional to 25.56, 35.28 and 20.72

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Solution

The fourth proportional to 25.56, 35.28 and 20.72 is: 28.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.56 : 35.28 = 20.72 : x
  2. Step 2: Convert to fraction form
    25.56/35.28 = 20.72/x
  3. Step 3: Cross multiply
    25.56x = 35.28 × 20.72
  4. Step 4: Simplify right side
    25.56x = 730.83
  5. Step 5: Solve for x
    x = 730.83/25.56
  6. Step 6: Final answer
    x = 28.59

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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.