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Finding the Fourth Proportional to 26.26, 39.40 and 15.43

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Solution

The fourth proportional to 26.26, 39.40 and 15.43 is: 23.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.26 : 39.40 = 15.43 : x
  2. Step 2: Convert to fraction form
    26.26/39.40 = 15.43/x
  3. Step 3: Cross multiply
    26.26x = 39.40 × 15.43
  4. Step 4: Simplify right side
    26.26x = 607.94
  5. Step 5: Solve for x
    x = 607.94/26.26
  6. Step 6: Final answer
    x = 23.15

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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.