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Finding the Fourth Proportional to 209.85, 288.91 and 195.13

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Solution

The fourth proportional to 209.85, 288.91 and 195.13 is: 268.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.85 : 288.91 = 195.13 : x
  2. Step 2: Convert to fraction form
    209.85/288.91 = 195.13/x
  3. Step 3: Cross multiply
    209.85x = 288.91 × 195.13
  4. Step 4: Simplify right side
    209.85x = 56,374.03
  5. Step 5: Solve for x
    x = 56,374.03/209.85
  6. Step 6: Final answer
    x = 268.64

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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.