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Finding the Fourth Proportional to 309.29, 425.05 and 243.68

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Solution

The fourth proportional to 309.29, 425.05 and 243.68 is: 334.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.29 : 425.05 = 243.68 : x
  2. Step 2: Convert to fraction form
    309.29/425.05 = 243.68/x
  3. Step 3: Cross multiply
    309.29x = 425.05 × 243.68
  4. Step 4: Simplify right side
    309.29x = 103,573.45
  5. Step 5: Solve for x
    x = 103,573.45/309.29
  6. Step 6: Final answer
    x = 334.88

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.