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Finding the Fourth Proportional to 960.90, 1,326.42 and 611.88

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Solution

The fourth proportional to 960.90, 1,326.42 and 611.88 is: 844.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.90 : 1,326.42 = 611.88 : x
  2. Step 2: Convert to fraction form
    960.90/1,326.42 = 611.88/x
  3. Step 3: Cross multiply
    960.90x = 1,326.42 × 611.88
  4. Step 4: Simplify right side
    960.90x = 811,609.87
  5. Step 5: Solve for x
    x = 811,609.87/960.90
  6. Step 6: Final answer
    x = 844.64

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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.