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Finding the Fourth Proportional to 516.32, 774.86 and 321.60

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Solution

The fourth proportional to 516.32, 774.86 and 321.60 is: 482.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.32 : 774.86 = 321.60 : x
  2. Step 2: Convert to fraction form
    516.32/774.86 = 321.60/x
  3. Step 3: Cross multiply
    516.32x = 774.86 × 321.60
  4. Step 4: Simplify right side
    516.32x = 249,198.08
  5. Step 5: Solve for x
    x = 249,198.08/516.32
  6. Step 6: Final answer
    x = 482.64

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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.