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Finding the Fourth Proportional to 309.91, 427.84 and 191.92

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Solution

The fourth proportional to 309.91, 427.84 and 191.92 is: 264.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.91 : 427.84 = 191.92 : x
  2. Step 2: Convert to fraction form
    309.91/427.84 = 191.92/x
  3. Step 3: Cross multiply
    309.91x = 427.84 × 191.92
  4. Step 4: Simplify right side
    309.91x = 82,109.50
  5. Step 5: Solve for x
    x = 82,109.50/309.91
  6. Step 6: Final answer
    x = 264.95

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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.