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Finding the Fourth Proportional to 960.07, 1,321.63 and 861.79

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Solution

The fourth proportional to 960.07, 1,321.63 and 861.79 is: 1,186.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.07 : 1,321.63 = 861.79 : x
  2. Step 2: Convert to fraction form
    960.07/1,321.63 = 861.79/x
  3. Step 3: Cross multiply
    960.07x = 1,321.63 × 861.79
  4. Step 4: Simplify right side
    960.07x = 1,138,967.52
  5. Step 5: Solve for x
    x = 1,138,967.52/960.07
  6. Step 6: Final answer
    x = 1,186.34

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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.