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Finding the Fourth Proportional to 12.87, 19.27 and 9.65

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Solution

The fourth proportional to 12.87, 19.27 and 9.65 is: 14.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.87 : 19.27 = 9.65 : x
  2. Step 2: Convert to fraction form
    12.87/19.27 = 9.65/x
  3. Step 3: Cross multiply
    12.87x = 19.27 × 9.65
  4. Step 4: Simplify right side
    12.87x = 185.96
  5. Step 5: Solve for x
    x = 185.96/12.87
  6. Step 6: Final answer
    x = 14.45

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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.