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Finding the Fourth Proportional to 309.33, 427.03 and 239.23

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Solution

The fourth proportional to 309.33, 427.03 and 239.23 is: 330.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.33 : 427.03 = 239.23 : x
  2. Step 2: Convert to fraction form
    309.33/427.03 = 239.23/x
  3. Step 3: Cross multiply
    309.33x = 427.03 × 239.23
  4. Step 4: Simplify right side
    309.33x = 102,155.06
  5. Step 5: Solve for x
    x = 102,155.06/309.33
  6. Step 6: Final answer
    x = 330.25

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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.