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Finding the Fourth Proportional to 20.66, 30.93 and 19.17

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Solution

The fourth proportional to 20.66, 30.93 and 19.17 is: 28.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.66 : 30.93 = 19.17 : x
  2. Step 2: Convert to fraction form
    20.66/30.93 = 19.17/x
  3. Step 3: Cross multiply
    20.66x = 30.93 × 19.17
  4. Step 4: Simplify right side
    20.66x = 592.93
  5. Step 5: Solve for x
    x = 592.93/20.66
  6. Step 6: Final answer
    x = 28.71

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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.