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Finding the Fourth Proportional to 715.19, 986.81 and 516.31

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Solution

The fourth proportional to 715.19, 986.81 and 516.31 is: 712.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.19 : 986.81 = 516.31 : x
  2. Step 2: Convert to fraction form
    715.19/986.81 = 516.31/x
  3. Step 3: Cross multiply
    715.19x = 986.81 × 516.31
  4. Step 4: Simplify right side
    715.19x = 509,503.28
  5. Step 5: Solve for x
    x = 509,503.28/715.19
  6. Step 6: Final answer
    x = 712.41

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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.