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Finding the Fourth Proportional to 20.59, 30.73 and 17.56

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Solution

The fourth proportional to 20.59, 30.73 and 17.56 is: 26.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.59 : 30.73 = 17.56 : x
  2. Step 2: Convert to fraction form
    20.59/30.73 = 17.56/x
  3. Step 3: Cross multiply
    20.59x = 30.73 × 17.56
  4. Step 4: Simplify right side
    20.59x = 539.62
  5. Step 5: Solve for x
    x = 539.62/20.59
  6. Step 6: Final answer
    x = 26.21

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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.