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Finding the Fourth Proportional to 516.40, 712.36 and 319.84

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Solution

The fourth proportional to 516.40, 712.36 and 319.84 is: 441.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.40 : 712.36 = 319.84 : x
  2. Step 2: Convert to fraction form
    516.40/712.36 = 319.84/x
  3. Step 3: Cross multiply
    516.40x = 712.36 × 319.84
  4. Step 4: Simplify right side
    516.40x = 227,841.22
  5. Step 5: Solve for x
    x = 227,841.22/516.40
  6. Step 6: Final answer
    x = 441.21

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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.