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Finding the Fourth Proportional to 209.93, 289.56 and 139.96

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Solution

The fourth proportional to 209.93, 289.56 and 139.96 is: 193.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.93 : 289.56 = 139.96 : x
  2. Step 2: Convert to fraction form
    209.93/289.56 = 139.96/x
  3. Step 3: Cross multiply
    209.93x = 289.56 × 139.96
  4. Step 4: Simplify right side
    209.93x = 40,524.67
  5. Step 5: Solve for x
    x = 40,524.67/209.93
  6. Step 6: Final answer
    x = 193.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.