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Finding the Fourth Proportional to 513.99, 770.42 and 239.78

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Solution

The fourth proportional to 513.99, 770.42 and 239.78 is: 359.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.99 : 770.42 = 239.78 : x
  2. Step 2: Convert to fraction form
    513.99/770.42 = 239.78/x
  3. Step 3: Cross multiply
    513.99x = 770.42 × 239.78
  4. Step 4: Simplify right side
    513.99x = 184,726.26
  5. Step 5: Solve for x
    x = 184,726.26/513.99
  6. Step 6: Final answer
    x = 359.40

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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.