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Finding the Fourth Proportional to 756.73, 1,139.56 and 680.59

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Solution

The fourth proportional to 756.73, 1,139.56 and 680.59 is: 1,024.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.73 : 1,139.56 = 680.59 : x
  2. Step 2: Convert to fraction form
    756.73/1,139.56 = 680.59/x
  3. Step 3: Cross multiply
    756.73x = 1,139.56 × 680.59
  4. Step 4: Simplify right side
    756.73x = 775,573.14
  5. Step 5: Solve for x
    x = 775,573.14/756.73
  6. Step 6: Final answer
    x = 1,024.90

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.