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Finding the Fourth Proportional to 960.60, 1,325.16 and 611.40

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Solution

The fourth proportional to 960.60, 1,325.16 and 611.40 is: 843.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.60 : 1,325.16 = 611.40 : x
  2. Step 2: Convert to fraction form
    960.60/1,325.16 = 611.40/x
  3. Step 3: Cross multiply
    960.60x = 1,325.16 × 611.40
  4. Step 4: Simplify right side
    960.60x = 810,202.82
  5. Step 5: Solve for x
    x = 810,202.82/960.60
  6. Step 6: Final answer
    x = 843.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.