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Finding the Fourth Proportional to 756.42, 1,134.90 and 391.38

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Solution

The fourth proportional to 756.42, 1,134.90 and 391.38 is: 587.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.42 : 1,134.90 = 391.38 : x
  2. Step 2: Convert to fraction form
    756.42/1,134.90 = 391.38/x
  3. Step 3: Cross multiply
    756.42x = 1,134.90 × 391.38
  4. Step 4: Simplify right side
    756.42x = 444,177.16
  5. Step 5: Solve for x
    x = 444,177.16/756.42
  6. Step 6: Final answer
    x = 587.21

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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.