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Finding the Fourth Proportional to 516.38, 713.57 and 491.13

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Solution

The fourth proportional to 516.38, 713.57 and 491.13 is: 678.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.38 : 713.57 = 491.13 : x
  2. Step 2: Convert to fraction form
    516.38/713.57 = 491.13/x
  3. Step 3: Cross multiply
    516.38x = 713.57 × 491.13
  4. Step 4: Simplify right side
    516.38x = 350,453.18
  5. Step 5: Solve for x
    x = 350,453.18/516.38
  6. Step 6: Final answer
    x = 678.68

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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.