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Finding the Fourth Proportional to 26.76, 39.99 and 21.36

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Solution

The fourth proportional to 26.76, 39.99 and 21.36 is: 31.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.76 : 39.99 = 21.36 : x
  2. Step 2: Convert to fraction form
    26.76/39.99 = 21.36/x
  3. Step 3: Cross multiply
    26.76x = 39.99 × 21.36
  4. Step 4: Simplify right side
    26.76x = 854.19
  5. Step 5: Solve for x
    x = 854.19/26.76
  6. Step 6: Final answer
    x = 31.92

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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.