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Finding the Fourth Proportional to 15.86, 21.94 and 15.12

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Solution

The fourth proportional to 15.86, 21.94 and 15.12 is: 20.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.86 : 21.94 = 15.12 : x
  2. Step 2: Convert to fraction form
    15.86/21.94 = 15.12/x
  3. Step 3: Cross multiply
    15.86x = 21.94 × 15.12
  4. Step 4: Simplify right side
    15.86x = 331.70
  5. Step 5: Solve for x
    x = 331.70/15.86
  6. Step 6: Final answer
    x = 20.91

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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.