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Finding the Fourth Proportional to 26.40, 36.40 and 21.79

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Solution

The fourth proportional to 26.40, 36.40 and 21.79 is: 30.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.40 : 36.40 = 21.79 : x
  2. Step 2: Convert to fraction form
    26.40/36.40 = 21.79/x
  3. Step 3: Cross multiply
    26.40x = 36.40 × 21.79
  4. Step 4: Simplify right side
    26.40x = 793.05
  5. Step 5: Solve for x
    x = 793.05/26.40
  6. Step 6: Final answer
    x = 30.05

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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.