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Finding the Fourth Proportional to 26.28, 39.36 and 12.72

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Solution

The fourth proportional to 26.28, 39.36 and 12.72 is: 19.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.28 : 39.36 = 12.72 : x
  2. Step 2: Convert to fraction form
    26.28/39.36 = 12.72/x
  3. Step 3: Cross multiply
    26.28x = 39.36 × 12.72
  4. Step 4: Simplify right side
    26.28x = 500.66
  5. Step 5: Solve for x
    x = 500.66/26.28
  6. Step 6: Final answer
    x = 19.05

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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.