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Finding the Fourth Proportional to 757.21, 1,136.43 and 392.11

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Solution

The fourth proportional to 757.21, 1,136.43 and 392.11 is: 588.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.21 : 1,136.43 = 392.11 : x
  2. Step 2: Convert to fraction form
    757.21/1,136.43 = 392.11/x
  3. Step 3: Cross multiply
    757.21x = 1,136.43 × 392.11
  4. Step 4: Simplify right side
    757.21x = 445,605.57
  5. Step 5: Solve for x
    x = 445,605.57/757.21
  6. Step 6: Final answer
    x = 588.48

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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.