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Finding the Fourth Proportional to 26.63, 40.09 and 20.69

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Solution

The fourth proportional to 26.63, 40.09 and 20.69 is: 31.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.63 : 40.09 = 20.69 : x
  2. Step 2: Convert to fraction form
    26.63/40.09 = 20.69/x
  3. Step 3: Cross multiply
    26.63x = 40.09 × 20.69
  4. Step 4: Simplify right side
    26.63x = 829.46
  5. Step 5: Solve for x
    x = 829.46/26.63
  6. Step 6: Final answer
    x = 31.15

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.