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Finding the Fourth Proportional to 208.06, 312.23 and 79.81

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Solution

The fourth proportional to 208.06, 312.23 and 79.81 is: 119.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.06 : 312.23 = 79.81 : x
  2. Step 2: Convert to fraction form
    208.06/312.23 = 79.81/x
  3. Step 3: Cross multiply
    208.06x = 312.23 × 79.81
  4. Step 4: Simplify right side
    208.06x = 24,919.86
  5. Step 5: Solve for x
    x = 24,919.86/208.06
  6. Step 6: Final answer
    x = 119.77

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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.