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Finding the Fourth Proportional to 958.80, 1,321.74 and 608.88

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Solution

The fourth proportional to 958.80, 1,321.74 and 608.88 is: 839.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.80 : 1,321.74 = 608.88 : x
  2. Step 2: Convert to fraction form
    958.80/1,321.74 = 608.88/x
  3. Step 3: Cross multiply
    958.80x = 1,321.74 × 608.88
  4. Step 4: Simplify right side
    958.80x = 804,781.05
  5. Step 5: Solve for x
    x = 804,781.05/958.80
  6. Step 6: Final answer
    x = 839.36

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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.