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Finding the Fourth Proportional to 208.86, 313.35 and 122.18

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Solution

The fourth proportional to 208.86, 313.35 and 122.18 is: 183.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.86 : 313.35 = 122.18 : x
  2. Step 2: Convert to fraction form
    208.86/313.35 = 122.18/x
  3. Step 3: Cross multiply
    208.86x = 313.35 × 122.18
  4. Step 4: Simplify right side
    208.86x = 38,282.93
  5. Step 5: Solve for x
    x = 38,282.93/208.86
  6. Step 6: Final answer
    x = 183.29

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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.