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Finding the Fourth Proportional to 756.22, 1,134.41 and 391.09

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Solution

The fourth proportional to 756.22, 1,134.41 and 391.09 is: 586.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.22 : 1,134.41 = 391.09 : x
  2. Step 2: Convert to fraction form
    756.22/1,134.41 = 391.09/x
  3. Step 3: Cross multiply
    756.22x = 1,134.41 × 391.09
  4. Step 4: Simplify right side
    756.22x = 443,656.41
  5. Step 5: Solve for x
    x = 443,656.41/756.22
  6. Step 6: Final answer
    x = 586.68

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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.