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Finding the Fourth Proportional to 209.95, 289.73 and 116.70

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Solution

The fourth proportional to 209.95, 289.73 and 116.70 is: 161.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.95 : 289.73 = 116.70 : x
  2. Step 2: Convert to fraction form
    209.95/289.73 = 116.70/x
  3. Step 3: Cross multiply
    209.95x = 289.73 × 116.70
  4. Step 4: Simplify right side
    209.95x = 33,811.49
  5. Step 5: Solve for x
    x = 33,811.49/209.95
  6. Step 6: Final answer
    x = 161.05

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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.