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Finding the Fourth Proportional to 680.04, 939.72 and 513.96

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Solution

The fourth proportional to 680.04, 939.72 and 513.96 is: 710.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.04 : 939.72 = 513.96 : x
  2. Step 2: Convert to fraction form
    680.04/939.72 = 513.96/x
  3. Step 3: Cross multiply
    680.04x = 939.72 × 513.96
  4. Step 4: Simplify right side
    680.04x = 482,978.49
  5. Step 5: Solve for x
    x = 482,978.49/680.04
  6. Step 6: Final answer
    x = 710.22

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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.