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Finding the Fourth Proportional to 516.78, 774.56 and 242.80

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Solution

The fourth proportional to 516.78, 774.56 and 242.80 is: 363.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.78 : 774.56 = 242.80 : x
  2. Step 2: Convert to fraction form
    516.78/774.56 = 242.80/x
  3. Step 3: Cross multiply
    516.78x = 774.56 × 242.80
  4. Step 4: Simplify right side
    516.78x = 188,061.84
  5. Step 5: Solve for x
    x = 188,061.84/516.78
  6. Step 6: Final answer
    x = 363.91

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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.