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Finding the Fourth Proportional to 513.53, 769.74 and 239.21

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Solution

The fourth proportional to 513.53, 769.74 and 239.21 is: 358.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.53 : 769.74 = 239.21 : x
  2. Step 2: Convert to fraction form
    513.53/769.74 = 239.21/x
  3. Step 3: Cross multiply
    513.53x = 769.74 × 239.21
  4. Step 4: Simplify right side
    513.53x = 184,129.51
  5. Step 5: Solve for x
    x = 184,129.51/513.53
  6. Step 6: Final answer
    x = 358.56

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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.