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Finding the Fourth Proportional to 26.62, 39.90 and 21.28

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Solution

The fourth proportional to 26.62, 39.90 and 21.28 is: 31.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.62 : 39.90 = 21.28 : x
  2. Step 2: Convert to fraction form
    26.62/39.90 = 21.28/x
  3. Step 3: Cross multiply
    26.62x = 39.90 × 21.28
  4. Step 4: Simplify right side
    26.62x = 849.07
  5. Step 5: Solve for x
    x = 849.07/26.62
  6. Step 6: Final answer
    x = 31.90

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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.