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Finding the Fourth Proportional to 756.57, 1,134.86 and 391.14

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Solution

The fourth proportional to 756.57, 1,134.86 and 391.14 is: 586.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.57 : 1,134.86 = 391.14 : x
  2. Step 2: Convert to fraction form
    756.57/1,134.86 = 391.14/x
  3. Step 3: Cross multiply
    756.57x = 1,134.86 × 391.14
  4. Step 4: Simplify right side
    756.57x = 443,889.14
  5. Step 5: Solve for x
    x = 443,889.14/756.57
  6. Step 6: Final answer
    x = 586.71

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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.