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Finding the Fourth Proportional to 20.60, 28.08 and 20.60

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Solution

The fourth proportional to 20.60, 28.08 and 20.60 is: 28.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.60 : 28.08 = 20.60 : x
  2. Step 2: Convert to fraction form
    20.60/28.08 = 20.60/x
  3. Step 3: Cross multiply
    20.60x = 28.08 × 20.60
  4. Step 4: Simplify right side
    20.60x = 578.45
  5. Step 5: Solve for x
    x = 578.45/20.60
  6. Step 6: Final answer
    x = 28.08

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.