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Finding the Fourth Proportional to 516.81, 713.21 and 280.76

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Solution

The fourth proportional to 516.81, 713.21 and 280.76 is: 387.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.81 : 713.21 = 280.76 : x
  2. Step 2: Convert to fraction form
    516.81/713.21 = 280.76/x
  3. Step 3: Cross multiply
    516.81x = 713.21 × 280.76
  4. Step 4: Simplify right side
    516.81x = 200,241.22
  5. Step 5: Solve for x
    x = 200,241.22/516.81
  6. Step 6: Final answer
    x = 387.45

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Find fourth proportional to 258.41, 356.60 and 140.38
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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.