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Finding the Fourth Proportional to 513.70, 769.74 and 398.42

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Solution

The fourth proportional to 513.70, 769.74 and 398.42 is: 597.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.70 : 769.74 = 398.42 : x
  2. Step 2: Convert to fraction form
    513.70/769.74 = 398.42/x
  3. Step 3: Cross multiply
    513.70x = 769.74 × 398.42
  4. Step 4: Simplify right side
    513.70x = 306,679.81
  5. Step 5: Solve for x
    x = 306,679.81/513.70
  6. Step 6: Final answer
    x = 597.00

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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.