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Finding the Fourth Proportional to 516.09, 712.15 and 283.21

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Solution

The fourth proportional to 516.09, 712.15 and 283.21 is: 390.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.09 : 712.15 = 283.21 : x
  2. Step 2: Convert to fraction form
    516.09/712.15 = 283.21/x
  3. Step 3: Cross multiply
    516.09x = 712.15 × 283.21
  4. Step 4: Simplify right side
    516.09x = 201,688.00
  5. Step 5: Solve for x
    x = 201,688.00/516.09
  6. Step 6: Final answer
    x = 390.80

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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.