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Finding the Fourth Proportional to 517.70, 774.72 and 394.98

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Solution

The fourth proportional to 517.70, 774.72 and 394.98 is: 591.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.70 : 774.72 = 394.98 : x
  2. Step 2: Convert to fraction form
    517.70/774.72 = 394.98/x
  3. Step 3: Cross multiply
    517.70x = 774.72 × 394.98
  4. Step 4: Simplify right side
    517.70x = 305,998.91
  5. Step 5: Solve for x
    x = 305,998.91/517.70
  6. Step 6: Final answer
    x = 591.08

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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.