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Finding the Fourth Proportional to 20.68, 28.50 and 19.72

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Solution

The fourth proportional to 20.68, 28.50 and 19.72 is: 27.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.68 : 28.50 = 19.72 : x
  2. Step 2: Convert to fraction form
    20.68/28.50 = 19.72/x
  3. Step 3: Cross multiply
    20.68x = 28.50 × 19.72
  4. Step 4: Simplify right side
    20.68x = 562.02
  5. Step 5: Solve for x
    x = 562.02/20.68
  6. Step 6: Final answer
    x = 27.18

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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.