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Finding the Fourth Proportional to 35.45, 48.90 and 20.88

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Solution

The fourth proportional to 35.45, 48.90 and 20.88 is: 28.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.45 : 48.90 = 20.88 : x
  2. Step 2: Convert to fraction form
    35.45/48.90 = 20.88/x
  3. Step 3: Cross multiply
    35.45x = 48.90 × 20.88
  4. Step 4: Simplify right side
    35.45x = 1,021.03
  5. Step 5: Solve for x
    x = 1,021.03/35.45
  6. Step 6: Final answer
    x = 28.81

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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.