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Finding the Fourth Proportional to 82.20, 123.41 and 47.99

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Solution

The fourth proportional to 82.20, 123.41 and 47.99 is: 72.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.20 : 123.41 = 47.99 : x
  2. Step 2: Convert to fraction form
    82.20/123.41 = 47.99/x
  3. Step 3: Cross multiply
    82.20x = 123.41 × 47.99
  4. Step 4: Simplify right side
    82.20x = 5,922.60
  5. Step 5: Solve for x
    x = 5,922.60/82.20
  6. Step 6: Final answer
    x = 72.05

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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.