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Finding the Fourth Proportional to 81.99, 123 and 30.63

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Solution

The fourth proportional to 81.99, 123 and 30.63 is: 45.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.99 : 123 = 30.63 : x
  2. Step 2: Convert to fraction form
    81.99/123 = 30.63/x
  3. Step 3: Cross multiply
    81.99x = 123 × 30.63
  4. Step 4: Simplify right side
    81.99x = 3,767.49
  5. Step 5: Solve for x
    x = 3,767.49/81.99
  6. Step 6: Final answer
    x = 45.95

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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.