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Finding the Fourth Proportional to 513.36, 768.74 and 339.50

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Solution

The fourth proportional to 513.36, 768.74 and 339.50 is: 508.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.36 : 768.74 = 339.50 : x
  2. Step 2: Convert to fraction form
    513.36/768.74 = 339.50/x
  3. Step 3: Cross multiply
    513.36x = 768.74 × 339.50
  4. Step 4: Simplify right side
    513.36x = 260,985.04
  5. Step 5: Solve for x
    x = 260,985.04/513.36
  6. Step 6: Final answer
    x = 508.39

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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.