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Finding the Fourth Proportional to 313.49, 433.19 and 239.69

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Solution

The fourth proportional to 313.49, 433.19 and 239.69 is: 331.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.49 : 433.19 = 239.69 : x
  2. Step 2: Convert to fraction form
    313.49/433.19 = 239.69/x
  3. Step 3: Cross multiply
    313.49x = 433.19 × 239.69
  4. Step 4: Simplify right side
    313.49x = 103,830.11
  5. Step 5: Solve for x
    x = 103,830.11/313.49
  6. Step 6: Final answer
    x = 331.21

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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.