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Finding the Fourth Proportional to 26.81, 40.17 and 21.12

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Solution

The fourth proportional to 26.81, 40.17 and 21.12 is: 31.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.81 : 40.17 = 21.12 : x
  2. Step 2: Convert to fraction form
    26.81/40.17 = 21.12/x
  3. Step 3: Cross multiply
    26.81x = 40.17 × 21.12
  4. Step 4: Simplify right side
    26.81x = 848.32
  5. Step 5: Solve for x
    x = 848.32/26.81
  6. Step 6: Final answer
    x = 31.64

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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.