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Finding the Fourth Proportional to 513.05, 767.85 and 390.62

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Solution

The fourth proportional to 513.05, 767.85 and 390.62 is: 584.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.05 : 767.85 = 390.62 : x
  2. Step 2: Convert to fraction form
    513.05/767.85 = 390.62/x
  3. Step 3: Cross multiply
    513.05x = 767.85 × 390.62
  4. Step 4: Simplify right side
    513.05x = 299,933.73
  5. Step 5: Solve for x
    x = 299,933.73/513.05
  6. Step 6: Final answer
    x = 584.61

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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.