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Finding the Fourth Proportional to 756.41, 1,135.22 and 391.30

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Solution

The fourth proportional to 756.41, 1,135.22 and 391.30 is: 587.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.41 : 1,135.22 = 391.30 : x
  2. Step 2: Convert to fraction form
    756.41/1,135.22 = 391.30/x
  3. Step 3: Cross multiply
    756.41x = 1,135.22 × 391.30
  4. Step 4: Simplify right side
    756.41x = 444,211.59
  5. Step 5: Solve for x
    x = 444,211.59/756.41
  6. Step 6: Final answer
    x = 587.26

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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.