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Finding the Fourth Proportional to 209.09, 288.47 and 139.12

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Solution

The fourth proportional to 209.09, 288.47 and 139.12 is: 191.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.09 : 288.47 = 139.12 : x
  2. Step 2: Convert to fraction form
    209.09/288.47 = 139.12/x
  3. Step 3: Cross multiply
    209.09x = 288.47 × 139.12
  4. Step 4: Simplify right side
    209.09x = 40,131.57
  5. Step 5: Solve for x
    x = 40,131.57/209.09
  6. Step 6: Final answer
    x = 191.93

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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.