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Finding the Fourth Proportional to 209.88, 289.73 and 139.03

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Solution

The fourth proportional to 209.88, 289.73 and 139.03 is: 191.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.88 : 289.73 = 139.03 : x
  2. Step 2: Convert to fraction form
    209.88/289.73 = 139.03/x
  3. Step 3: Cross multiply
    209.88x = 289.73 × 139.03
  4. Step 4: Simplify right side
    209.88x = 40,280.79
  5. Step 5: Solve for x
    x = 40,280.79/209.88
  6. Step 6: Final answer
    x = 191.92

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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.