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Finding the Fourth Proportional to 756.38, 1,134.88 and 391.28

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Solution

The fourth proportional to 756.38, 1,134.88 and 391.28 is: 587.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.38 : 1,134.88 = 391.28 : x
  2. Step 2: Convert to fraction form
    756.38/1,134.88 = 391.28/x
  3. Step 3: Cross multiply
    756.38x = 1,134.88 × 391.28
  4. Step 4: Simplify right side
    756.38x = 444,049.19
  5. Step 5: Solve for x
    x = 444,049.19/756.38
  6. Step 6: Final answer
    x = 587.07

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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.