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Finding the Fourth Proportional to 349.12, 523.79 and 143.78

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Solution

The fourth proportional to 349.12, 523.79 and 143.78 is: 215.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    349.12 : 523.79 = 143.78 : x
  2. Step 2: Convert to fraction form
    349.12/523.79 = 143.78/x
  3. Step 3: Cross multiply
    349.12x = 523.79 × 143.78
  4. Step 4: Simplify right side
    349.12x = 75,312.64
  5. Step 5: Solve for x
    x = 75,312.64/349.12
  6. Step 6: Final answer
    x = 215.72

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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.