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Finding the Fourth Proportional to 208.80, 288.63 and 191.79

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Solution

The fourth proportional to 208.80, 288.63 and 191.79 is: 265.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.80 : 288.63 = 191.79 : x
  2. Step 2: Convert to fraction form
    208.80/288.63 = 191.79/x
  3. Step 3: Cross multiply
    208.80x = 288.63 × 191.79
  4. Step 4: Simplify right side
    208.80x = 55,356.35
  5. Step 5: Solve for x
    x = 55,356.35/208.80
  6. Step 6: Final answer
    x = 265.12

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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.