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Finding the Fourth Proportional to 680.78, 939.76 and 515.04

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Solution

The fourth proportional to 680.78, 939.76 and 515.04 is: 710.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.78 : 939.76 = 515.04 : x
  2. Step 2: Convert to fraction form
    680.78/939.76 = 515.04/x
  3. Step 3: Cross multiply
    680.78x = 939.76 × 515.04
  4. Step 4: Simplify right side
    680.78x = 484,013.99
  5. Step 5: Solve for x
    x = 484,013.99/680.78
  6. Step 6: Final answer
    x = 710.97

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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.