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Finding the Fourth Proportional to 20.58, 28.44 and 14.78

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Solution

The fourth proportional to 20.58, 28.44 and 14.78 is: 20.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.58 : 28.44 = 14.78 : x
  2. Step 2: Convert to fraction form
    20.58/28.44 = 14.78/x
  3. Step 3: Cross multiply
    20.58x = 28.44 × 14.78
  4. Step 4: Simplify right side
    20.58x = 420.34
  5. Step 5: Solve for x
    x = 420.34/20.58
  6. Step 6: Final answer
    x = 20.42

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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.