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Finding the Fourth Proportional to 26.72, 40 and 20.64

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Solution

The fourth proportional to 26.72, 40 and 20.64 is: 30.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.72 : 40 = 20.64 : x
  2. Step 2: Convert to fraction form
    26.72/40 = 20.64/x
  3. Step 3: Cross multiply
    26.72x = 40 × 20.64
  4. Step 4: Simplify right side
    26.72x = 825.60
  5. Step 5: Solve for x
    x = 825.60/26.72
  6. Step 6: Final answer
    x = 30.90

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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.