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Finding the Fourth Proportional to 513.84, 770.78 and 129.09

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Solution

The fourth proportional to 513.84, 770.78 and 129.09 is: 193.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.84 : 770.78 = 129.09 : x
  2. Step 2: Convert to fraction form
    513.84/770.78 = 129.09/x
  3. Step 3: Cross multiply
    513.84x = 770.78 × 129.09
  4. Step 4: Simplify right side
    513.84x = 99,503.20
  5. Step 5: Solve for x
    x = 99,503.20/513.84
  6. Step 6: Final answer
    x = 193.64

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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.