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Finding the Fourth Proportional to 26.28, 39.23 and 21.72

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Solution

The fourth proportional to 26.28, 39.23 and 21.72 is: 32.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.28 : 39.23 = 21.72 : x
  2. Step 2: Convert to fraction form
    26.28/39.23 = 21.72/x
  3. Step 3: Cross multiply
    26.28x = 39.23 × 21.72
  4. Step 4: Simplify right side
    26.28x = 852.08
  5. Step 5: Solve for x
    x = 852.08/26.28
  6. Step 6: Final answer
    x = 32.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.