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Finding the Fourth Proportional to 756.98, 1,136.07 and 391.87

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Solution

The fourth proportional to 756.98, 1,136.07 and 391.87 is: 588.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.98 : 1,136.07 = 391.87 : x
  2. Step 2: Convert to fraction form
    756.98/1,136.07 = 391.87/x
  3. Step 3: Cross multiply
    756.98x = 1,136.07 × 391.87
  4. Step 4: Simplify right side
    756.98x = 445,188.91
  5. Step 5: Solve for x
    x = 445,188.91/756.98
  6. Step 6: Final answer
    x = 588.12

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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.