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Finding the Fourth Proportional to 20.34, 28.04 and 13.05

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Solution

The fourth proportional to 20.34, 28.04 and 13.05 is: 17.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.34 : 28.04 = 13.05 : x
  2. Step 2: Convert to fraction form
    20.34/28.04 = 13.05/x
  3. Step 3: Cross multiply
    20.34x = 28.04 × 13.05
  4. Step 4: Simplify right side
    20.34x = 365.86
  5. Step 5: Solve for x
    x = 365.86/20.34
  6. Step 6: Final answer
    x = 17.99

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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.