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Finding the Fourth Proportional to 349.30, 523.80 and 143.80

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Solution

The fourth proportional to 349.30, 523.80 and 143.80 is: 215.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    349.30 : 523.80 = 143.80 : x
  2. Step 2: Convert to fraction form
    349.30/523.80 = 143.80/x
  3. Step 3: Cross multiply
    349.30x = 523.80 × 143.80
  4. Step 4: Simplify right side
    349.30x = 75,322.44
  5. Step 5: Solve for x
    x = 75,322.44/349.30
  6. Step 6: Final answer
    x = 215.64

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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.