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Finding the Fourth Proportional to 35.92, 53.90 and 20.50

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Solution

The fourth proportional to 35.92, 53.90 and 20.50 is: 30.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    35.92 : 53.90 = 20.50 : x
  2. Step 2: Convert to fraction form
    35.92/53.90 = 20.50/x
  3. Step 3: Cross multiply
    35.92x = 53.90 × 20.50
  4. Step 4: Simplify right side
    35.92x = 1,104.95
  5. Step 5: Solve for x
    x = 1,104.95/35.92
  6. Step 6: Final answer
    x = 30.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.