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Finding the Fourth Proportional to 759.75, 1,138.34 and 661.15

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Solution

The fourth proportional to 759.75, 1,138.34 and 661.15 is: 990.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.75 : 1,138.34 = 661.15 : x
  2. Step 2: Convert to fraction form
    759.75/1,138.34 = 661.15/x
  3. Step 3: Cross multiply
    759.75x = 1,138.34 × 661.15
  4. Step 4: Simplify right side
    759.75x = 752,614.04
  5. Step 5: Solve for x
    x = 752,614.04/759.75
  6. Step 6: Final answer
    x = 990.60

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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.