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Finding the Fourth Proportional to 681.15, 939.58 and 516

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Solution

The fourth proportional to 681.15, 939.58 and 516 is: 711.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.15 : 939.58 = 516 : x
  2. Step 2: Convert to fraction form
    681.15/939.58 = 516/x
  3. Step 3: Cross multiply
    681.15x = 939.58 × 516
  4. Step 4: Simplify right side
    681.15x = 484,823.28
  5. Step 5: Solve for x
    x = 484,823.28/681.15
  6. Step 6: Final answer
    x = 711.77

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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.