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Finding the Fourth Proportional to 309.20, 426.28 and 192.72

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Solution

The fourth proportional to 309.20, 426.28 and 192.72 is: 265.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.20 : 426.28 = 192.72 : x
  2. Step 2: Convert to fraction form
    309.20/426.28 = 192.72/x
  3. Step 3: Cross multiply
    309.20x = 426.28 × 192.72
  4. Step 4: Simplify right side
    309.20x = 82,152.68
  5. Step 5: Solve for x
    x = 82,152.68/309.20
  6. Step 6: Final answer
    x = 265.69

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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.