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Finding the Fourth Proportional to 757.64, 1,134.94 and 387.43

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Solution

The fourth proportional to 757.64, 1,134.94 and 387.43 is: 580.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.64 : 1,134.94 = 387.43 : x
  2. Step 2: Convert to fraction form
    757.64/1,134.94 = 387.43/x
  3. Step 3: Cross multiply
    757.64x = 1,134.94 × 387.43
  4. Step 4: Simplify right side
    757.64x = 439,707.87
  5. Step 5: Solve for x
    x = 439,707.87/757.64
  6. Step 6: Final answer
    x = 580.37

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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.