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Finding the Fourth Proportional to 757.60, 1,134.90 and 667.40

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Solution

The fourth proportional to 757.60, 1,134.90 and 667.40 is: 999.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.60 : 1,134.90 = 667.40 : x
  2. Step 2: Convert to fraction form
    757.60/1,134.90 = 667.40/x
  3. Step 3: Cross multiply
    757.60x = 1,134.90 × 667.40
  4. Step 4: Simplify right side
    757.60x = 757,432.26
  5. Step 5: Solve for x
    x = 757,432.26/757.60
  6. Step 6: Final answer
    x = 999.78

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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.