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Finding the Fourth Proportional to 757.87, 1,137.53 and 660.67

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Solution

The fourth proportional to 757.87, 1,137.53 and 660.67 is: 991.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.87 : 1,137.53 = 660.67 : x
  2. Step 2: Convert to fraction form
    757.87/1,137.53 = 660.67/x
  3. Step 3: Cross multiply
    757.87x = 1,137.53 × 660.67
  4. Step 4: Simplify right side
    757.87x = 751,531.95
  5. Step 5: Solve for x
    x = 751,531.95/757.87
  6. Step 6: Final answer
    x = 991.64

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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.