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Finding the Fourth Proportional to 516.78, 712.80 and 330.30

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Solution

The fourth proportional to 516.78, 712.80 and 330.30 is: 455.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.78 : 712.80 = 330.30 : x
  2. Step 2: Convert to fraction form
    516.78/712.80 = 330.30/x
  3. Step 3: Cross multiply
    516.78x = 712.80 × 330.30
  4. Step 4: Simplify right side
    516.78x = 235,437.84
  5. Step 5: Solve for x
    x = 235,437.84/516.78
  6. Step 6: Final answer
    x = 455.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.