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Finding the Fourth Proportional to 513.40, 769.87 and 239.57

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Solution

The fourth proportional to 513.40, 769.87 and 239.57 is: 359.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.40 : 769.87 = 239.57 : x
  2. Step 2: Convert to fraction form
    513.40/769.87 = 239.57/x
  3. Step 3: Cross multiply
    513.40x = 769.87 × 239.57
  4. Step 4: Simplify right side
    513.40x = 184,437.76
  5. Step 5: Solve for x
    x = 184,437.76/513.40
  6. Step 6: Final answer
    x = 359.25

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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.