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Finding the Fourth Proportional to 959.22, 1,439.28 and 343.44

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Solution

The fourth proportional to 959.22, 1,439.28 and 343.44 is: 515.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.22 : 1,439.28 = 343.44 : x
  2. Step 2: Convert to fraction form
    959.22/1,439.28 = 343.44/x
  3. Step 3: Cross multiply
    959.22x = 1,439.28 × 343.44
  4. Step 4: Simplify right side
    959.22x = 494,306.32
  5. Step 5: Solve for x
    x = 494,306.32/959.22
  6. Step 6: Final answer
    x = 515.32

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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.