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Finding the Fourth Proportional to 20.92, 28.90 and 20.68

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Solution

The fourth proportional to 20.92, 28.90 and 20.68 is: 28.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.92 : 28.90 = 20.68 : x
  2. Step 2: Convert to fraction form
    20.92/28.90 = 20.68/x
  3. Step 3: Cross multiply
    20.92x = 28.90 × 20.68
  4. Step 4: Simplify right side
    20.92x = 597.65
  5. Step 5: Solve for x
    x = 597.65/20.92
  6. Step 6: Final answer
    x = 28.57

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1.5x scale

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.