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Finding the Fourth Proportional to 960.64, 1,325.88 and 611.28

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Solution

The fourth proportional to 960.64, 1,325.88 and 611.28 is: 843.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.64 : 1,325.88 = 611.28 : x
  2. Step 2: Convert to fraction form
    960.64/1,325.88 = 611.28/x
  3. Step 3: Cross multiply
    960.64x = 1,325.88 × 611.28
  4. Step 4: Simplify right side
    960.64x = 810,483.93
  5. Step 5: Solve for x
    x = 810,483.93/960.64
  6. Step 6: Final answer
    x = 843.69

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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.