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Finding the Fourth Proportional to 756.87, 1,136.09 and 670.75

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Solution

The fourth proportional to 756.87, 1,136.09 and 670.75 is: 1,006.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.87 : 1,136.09 = 670.75 : x
  2. Step 2: Convert to fraction form
    756.87/1,136.09 = 670.75/x
  3. Step 3: Cross multiply
    756.87x = 1,136.09 × 670.75
  4. Step 4: Simplify right side
    756.87x = 762,034.04
  5. Step 5: Solve for x
    x = 762,034.04/756.87
  6. Step 6: Final answer
    x = 1,006.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.