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Finding the Fourth Proportional to 757.62, 1,136.61 and 685.31

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Solution

The fourth proportional to 757.62, 1,136.61 and 685.31 is: 1,028.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.62 : 1,136.61 = 685.31 : x
  2. Step 2: Convert to fraction form
    757.62/1,136.61 = 685.31/x
  3. Step 3: Cross multiply
    757.62x = 1,136.61 × 685.31
  4. Step 4: Simplify right side
    757.62x = 778,924.52
  5. Step 5: Solve for x
    x = 778,924.52/757.62
  6. Step 6: Final answer
    x = 1,028.12

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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.