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Finding the Fourth Proportional to 912.09, 1,367.79 and 326.93

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Solution

The fourth proportional to 912.09, 1,367.79 and 326.93 is: 490.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.09 : 1,367.79 = 326.93 : x
  2. Step 2: Convert to fraction form
    912.09/1,367.79 = 326.93/x
  3. Step 3: Cross multiply
    912.09x = 1,367.79 × 326.93
  4. Step 4: Simplify right side
    912.09x = 447,164.75
  5. Step 5: Solve for x
    x = 447,164.75/912.09
  6. Step 6: Final answer
    x = 490.26

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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.