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Finding the Fourth Proportional to 50.99, 76.45 and 20.58

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Solution

The fourth proportional to 50.99, 76.45 and 20.58 is: 30.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    50.99 : 76.45 = 20.58 : x
  2. Step 2: Convert to fraction form
    50.99/76.45 = 20.58/x
  3. Step 3: Cross multiply
    50.99x = 76.45 × 20.58
  4. Step 4: Simplify right side
    50.99x = 1,573.29
  5. Step 5: Solve for x
    x = 1,573.29/50.99
  6. Step 6: Final answer
    x = 30.85

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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.