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Finding the Fourth Proportional to 209.93, 289.71 and 122.58

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Solution

The fourth proportional to 209.93, 289.71 and 122.58 is: 169.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.93 : 289.71 = 122.58 : x
  2. Step 2: Convert to fraction form
    209.93/289.71 = 122.58/x
  3. Step 3: Cross multiply
    209.93x = 289.71 × 122.58
  4. Step 4: Simplify right side
    209.93x = 35,512.65
  5. Step 5: Solve for x
    x = 35,512.65/209.93
  6. Step 6: Final answer
    x = 169.17

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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.