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Finding the Fourth Proportional to 349.21, 523.87 and 105.76

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Solution

The fourth proportional to 349.21, 523.87 and 105.76 is: 158.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    349.21 : 523.87 = 105.76 : x
  2. Step 2: Convert to fraction form
    349.21/523.87 = 105.76/x
  3. Step 3: Cross multiply
    349.21x = 523.87 × 105.76
  4. Step 4: Simplify right side
    349.21x = 55,402.92
  5. Step 5: Solve for x
    x = 55,402.92/349.21
  6. Step 6: Final answer
    x = 158.65

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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.