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Finding the Fourth Proportional to 516.81, 774.48 and 285.80

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Solution

The fourth proportional to 516.81, 774.48 and 285.80 is: 428.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.81 : 774.48 = 285.80 : x
  2. Step 2: Convert to fraction form
    516.81/774.48 = 285.80/x
  3. Step 3: Cross multiply
    516.81x = 774.48 × 285.80
  4. Step 4: Simplify right side
    516.81x = 221,348.32
  5. Step 5: Solve for x
    x = 221,348.32/516.81
  6. Step 6: Final answer
    x = 428.30

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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.