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Finding the Fourth Proportional to 82.12, 123 and 51.70

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Solution

The fourth proportional to 82.12, 123 and 51.70 is: 77.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.12 : 123 = 51.70 : x
  2. Step 2: Convert to fraction form
    82.12/123 = 51.70/x
  3. Step 3: Cross multiply
    82.12x = 123 × 51.70
  4. Step 4: Simplify right side
    82.12x = 6,359.10
  5. Step 5: Solve for x
    x = 6,359.10/82.12
  6. Step 6: Final answer
    x = 77.44

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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.