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Finding the Fourth Proportional to 313.09, 431.39 and 239.18

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Solution

The fourth proportional to 313.09, 431.39 and 239.18 is: 329.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.09 : 431.39 = 239.18 : x
  2. Step 2: Convert to fraction form
    313.09/431.39 = 239.18/x
  3. Step 3: Cross multiply
    313.09x = 431.39 × 239.18
  4. Step 4: Simplify right side
    313.09x = 103,178.30
  5. Step 5: Solve for x
    x = 103,178.30/313.09
  6. Step 6: Final answer
    x = 329.55

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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.