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Finding the Fourth Proportional to 680.96, 939.84 and 514.88

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Solution

The fourth proportional to 680.96, 939.84 and 514.88 is: 710.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.96 : 939.84 = 514.88 : x
  2. Step 2: Convert to fraction form
    680.96/939.84 = 514.88/x
  3. Step 3: Cross multiply
    680.96x = 939.84 × 514.88
  4. Step 4: Simplify right side
    680.96x = 483,904.82
  5. Step 5: Solve for x
    x = 483,904.82/680.96
  6. Step 6: Final answer
    x = 710.62

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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.