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Finding the Fourth Proportional to 19.68, 27.09 and 15.30

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Solution

The fourth proportional to 19.68, 27.09 and 15.30 is: 21.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.68 : 27.09 = 15.30 : x
  2. Step 2: Convert to fraction form
    19.68/27.09 = 15.30/x
  3. Step 3: Cross multiply
    19.68x = 27.09 × 15.30
  4. Step 4: Simplify right side
    19.68x = 414.48
  5. Step 5: Solve for x
    x = 414.48/19.68
  6. Step 6: Final answer
    x = 21.06

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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.