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Finding the Fourth Proportional to 15.86, 23.69 and 12.96

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Solution

The fourth proportional to 15.86, 23.69 and 12.96 is: 19.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.86 : 23.69 = 12.96 : x
  2. Step 2: Convert to fraction form
    15.86/23.69 = 12.96/x
  3. Step 3: Cross multiply
    15.86x = 23.69 × 12.96
  4. Step 4: Simplify right side
    15.86x = 307.05
  5. Step 5: Solve for x
    x = 307.05/15.86
  6. Step 6: Final answer
    x = 19.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.