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Finding the Fourth Proportional to 309.26, 426.64 and 191.18

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Solution

The fourth proportional to 309.26, 426.64 and 191.18 is: 263.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.26 : 426.64 = 191.18 : x
  2. Step 2: Convert to fraction form
    309.26/426.64 = 191.18/x
  3. Step 3: Cross multiply
    309.26x = 426.64 × 191.18
  4. Step 4: Simplify right side
    309.26x = 81,565.04
  5. Step 5: Solve for x
    x = 81,565.04/309.26
  6. Step 6: Final answer
    x = 263.74

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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.