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Finding the Fourth Proportional to 407.97, 611.96 and 191.43

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Solution

The fourth proportional to 407.97, 611.96 and 191.43 is: 287.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.97 : 611.96 = 191.43 : x
  2. Step 2: Convert to fraction form
    407.97/611.96 = 191.43/x
  3. Step 3: Cross multiply
    407.97x = 611.96 × 191.43
  4. Step 4: Simplify right side
    407.97x = 117,146.55
  5. Step 5: Solve for x
    x = 117,146.55/407.97
  6. Step 6: Final answer
    x = 287.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.