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Finding the Fourth Proportional to 208.71, 287.21 and 191.23

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Solution

The fourth proportional to 208.71, 287.21 and 191.23 is: 263.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.71 : 287.21 = 191.23 : x
  2. Step 2: Convert to fraction form
    208.71/287.21 = 191.23/x
  3. Step 3: Cross multiply
    208.71x = 287.21 × 191.23
  4. Step 4: Simplify right side
    208.71x = 54,922.93
  5. Step 5: Solve for x
    x = 54,922.93/208.71
  6. Step 6: Final answer
    x = 263.15

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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.