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Finding the Fourth Proportional to 19.65, 27.15 and 12.39

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Solution

The fourth proportional to 19.65, 27.15 and 12.39 is: 17.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.65 : 27.15 = 12.39 : x
  2. Step 2: Convert to fraction form
    19.65/27.15 = 12.39/x
  3. Step 3: Cross multiply
    19.65x = 27.15 × 12.39
  4. Step 4: Simplify right side
    19.65x = 336.39
  5. Step 5: Solve for x
    x = 336.39/19.65
  6. Step 6: Final answer
    x = 17.12

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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.