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Finding the Fourth Proportional to 958.40, 1,321.49 and 818.27

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Solution

The fourth proportional to 958.40, 1,321.49 and 818.27 is: 1,128.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.40 : 1,321.49 = 818.27 : x
  2. Step 2: Convert to fraction form
    958.40/1,321.49 = 818.27/x
  3. Step 3: Cross multiply
    958.40x = 1,321.49 × 818.27
  4. Step 4: Simplify right side
    958.40x = 1,081,331.06
  5. Step 5: Solve for x
    x = 1,081,331.06/958.40
  6. Step 6: Final answer
    x = 1,128.27

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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.