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Finding the Fourth Proportional to 518.73, 779.12 and 313.70

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Solution

The fourth proportional to 518.73, 779.12 and 313.70 is: 471.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.73 : 779.12 = 313.70 : x
  2. Step 2: Convert to fraction form
    518.73/779.12 = 313.70/x
  3. Step 3: Cross multiply
    518.73x = 779.12 × 313.70
  4. Step 4: Simplify right side
    518.73x = 244,407.85
  5. Step 5: Solve for x
    x = 244,407.85/518.73
  6. Step 6: Final answer
    x = 471.17

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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.