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Finding the Fourth Proportional to 513.17, 769.79 and 239.12

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Solution

The fourth proportional to 513.17, 769.79 and 239.12 is: 358.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.17 : 769.79 = 239.12 : x
  2. Step 2: Convert to fraction form
    513.17/769.79 = 239.12/x
  3. Step 3: Cross multiply
    513.17x = 769.79 × 239.12
  4. Step 4: Simplify right side
    513.17x = 184,071.82
  5. Step 5: Solve for x
    x = 184,071.82/513.17
  6. Step 6: Final answer
    x = 358.70

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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.