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Finding the Fourth Proportional to 309.28, 426.64 and 192.64

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Solution

The fourth proportional to 309.28, 426.64 and 192.64 is: 265.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.28 : 426.64 = 192.64 : x
  2. Step 2: Convert to fraction form
    309.28/426.64 = 192.64/x
  3. Step 3: Cross multiply
    309.28x = 426.64 × 192.64
  4. Step 4: Simplify right side
    309.28x = 82,187.93
  5. Step 5: Solve for x
    x = 82,187.93/309.28
  6. Step 6: Final answer
    x = 265.74

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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.