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Finding the Fourth Proportional to 757.91, 1,136.68 and 720.88

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Solution

The fourth proportional to 757.91, 1,136.68 and 720.88 is: 1,081.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.91 : 1,136.68 = 720.88 : x
  2. Step 2: Convert to fraction form
    757.91/1,136.68 = 720.88/x
  3. Step 3: Cross multiply
    757.91x = 1,136.68 × 720.88
  4. Step 4: Simplify right side
    757.91x = 819,409.88
  5. Step 5: Solve for x
    x = 819,409.88/757.91
  6. Step 6: Final answer
    x = 1,081.14

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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.