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Finding the Fourth Proportional to 26.30, 39.45 and 12.79

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Solution

The fourth proportional to 26.30, 39.45 and 12.79 is: 19.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.30 : 39.45 = 12.79 : x
  2. Step 2: Convert to fraction form
    26.30/39.45 = 12.79/x
  3. Step 3: Cross multiply
    26.30x = 39.45 × 12.79
  4. Step 4: Simplify right side
    26.30x = 504.37
  5. Step 5: Solve for x
    x = 504.37/26.30
  6. Step 6: Final answer
    x = 19.18

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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.