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Finding the Fourth Proportional to 959.43, 1,439.78 and 343.16

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Solution

The fourth proportional to 959.43, 1,439.78 and 343.16 is: 514.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.43 : 1,439.78 = 343.16 : x
  2. Step 2: Convert to fraction form
    959.43/1,439.78 = 343.16/x
  3. Step 3: Cross multiply
    959.43x = 1,439.78 × 343.16
  4. Step 4: Simplify right side
    959.43x = 494,075.44
  5. Step 5: Solve for x
    x = 494,075.44/959.43
  6. Step 6: Final answer
    x = 514.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.