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Finding the Fourth Proportional to 520.12, 778.61 and 390.62

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Solution

The fourth proportional to 520.12, 778.61 and 390.62 is: 584.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.12 : 778.61 = 390.62 : x
  2. Step 2: Convert to fraction form
    520.12/778.61 = 390.62/x
  3. Step 3: Cross multiply
    520.12x = 778.61 × 390.62
  4. Step 4: Simplify right side
    520.12x = 304,143.56
  5. Step 5: Solve for x
    x = 304,143.56/520.12
  6. Step 6: Final answer
    x = 584.76

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Double scale
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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.