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Finding the Fourth Proportional to 26.20, 39.28 and 19.79

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Solution

The fourth proportional to 26.20, 39.28 and 19.79 is: 29.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.20 : 39.28 = 19.79 : x
  2. Step 2: Convert to fraction form
    26.20/39.28 = 19.79/x
  3. Step 3: Cross multiply
    26.20x = 39.28 × 19.79
  4. Step 4: Simplify right side
    26.20x = 777.15
  5. Step 5: Solve for x
    x = 777.15/26.20
  6. Step 6: Final answer
    x = 29.66

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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.