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Finding the Fourth Proportional to 20.10, 27.90 and 19.35

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Solution

The fourth proportional to 20.10, 27.90 and 19.35 is: 26.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.10 : 27.90 = 19.35 : x
  2. Step 2: Convert to fraction form
    20.10/27.90 = 19.35/x
  3. Step 3: Cross multiply
    20.10x = 27.90 × 19.35
  4. Step 4: Simplify right side
    20.10x = 539.87
  5. Step 5: Solve for x
    x = 539.87/20.10
  6. Step 6: Final answer
    x = 26.86

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.