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Finding the Fourth Proportional to 15.90, 23.78 and 12.06

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Solution

The fourth proportional to 15.90, 23.78 and 12.06 is: 18.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.90 : 23.78 = 12.06 : x
  2. Step 2: Convert to fraction form
    15.90/23.78 = 12.06/x
  3. Step 3: Cross multiply
    15.90x = 23.78 × 12.06
  4. Step 4: Simplify right side
    15.90x = 286.61
  5. Step 5: Solve for x
    x = 286.61/15.90
  6. Step 6: Final answer
    x = 18.03

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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.