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Finding the Fourth Proportional to 26.79, 40.20 and 13.26

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Solution

The fourth proportional to 26.79, 40.20 and 13.26 is: 19.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.79 : 40.20 = 13.26 : x
  2. Step 2: Convert to fraction form
    26.79/40.20 = 13.26/x
  3. Step 3: Cross multiply
    26.79x = 40.20 × 13.26
  4. Step 4: Simplify right side
    26.79x = 533.05
  5. Step 5: Solve for x
    x = 533.05/26.79
  6. Step 6: Final answer
    x = 19.90

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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.