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Finding the Fourth Proportional to 958.09, 1,321.75 and 709.99

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Solution

The fourth proportional to 958.09, 1,321.75 and 709.99 is: 979.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.09 : 1,321.75 = 709.99 : x
  2. Step 2: Convert to fraction form
    958.09/1,321.75 = 709.99/x
  3. Step 3: Cross multiply
    958.09x = 1,321.75 × 709.99
  4. Step 4: Simplify right side
    958.09x = 938,429.28
  5. Step 5: Solve for x
    x = 938,429.28/958.09
  6. Step 6: Final answer
    x = 979.48

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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.