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Finding the Fourth Proportional to 26.82, 40.16 and 21.12

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Solution

The fourth proportional to 26.82, 40.16 and 21.12 is: 31.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.82 : 40.16 = 21.12 : x
  2. Step 2: Convert to fraction form
    26.82/40.16 = 21.12/x
  3. Step 3: Cross multiply
    26.82x = 40.16 × 21.12
  4. Step 4: Simplify right side
    26.82x = 848.18
  5. Step 5: Solve for x
    x = 848.18/26.82
  6. Step 6: Final answer
    x = 31.62

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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.