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Finding the Fourth Proportional to 15.90, 21.95 and 12.26

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Solution

The fourth proportional to 15.90, 21.95 and 12.26 is: 16.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.90 : 21.95 = 12.26 : x
  2. Step 2: Convert to fraction form
    15.90/21.95 = 12.26/x
  3. Step 3: Cross multiply
    15.90x = 21.95 × 12.26
  4. Step 4: Simplify right side
    15.90x = 269.05
  5. Step 5: Solve for x
    x = 269.05/15.90
  6. Step 6: Final answer
    x = 16.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.