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Finding the Fourth Proportional to 313.97, 471.17 and 191.86

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Solution

The fourth proportional to 313.97, 471.17 and 191.86 is: 287.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.97 : 471.17 = 191.86 : x
  2. Step 2: Convert to fraction form
    313.97/471.17 = 191.86/x
  3. Step 3: Cross multiply
    313.97x = 471.17 × 191.86
  4. Step 4: Simplify right side
    313.97x = 90,398.68
  5. Step 5: Solve for x
    x = 90,398.68/313.97
  6. Step 6: Final answer
    x = 287.92

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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.