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Finding the Fourth Proportional to 309.23, 426.81 and 239.16

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Solution

The fourth proportional to 309.23, 426.81 and 239.16 is: 330.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.23 : 426.81 = 239.16 : x
  2. Step 2: Convert to fraction form
    309.23/426.81 = 239.16/x
  3. Step 3: Cross multiply
    309.23x = 426.81 × 239.16
  4. Step 4: Simplify right side
    309.23x = 102,075.88
  5. Step 5: Solve for x
    x = 102,075.88/309.23
  6. Step 6: Final answer
    x = 330.10

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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.