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Finding the Fourth Proportional to 309.12, 426.66 and 192.64

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Solution

The fourth proportional to 309.12, 426.66 and 192.64 is: 265.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.12 : 426.66 = 192.64 : x
  2. Step 2: Convert to fraction form
    309.12/426.66 = 192.64/x
  3. Step 3: Cross multiply
    309.12x = 426.66 × 192.64
  4. Step 4: Simplify right side
    309.12x = 82,191.78
  5. Step 5: Solve for x
    x = 82,191.78/309.12
  6. Step 6: Final answer
    x = 265.89

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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.