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Finding the Fourth Proportional to 958.59, 1,321.52 and 643.29

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Solution

The fourth proportional to 958.59, 1,321.52 and 643.29 is: 886.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.59 : 1,321.52 = 643.29 : x
  2. Step 2: Convert to fraction form
    958.59/1,321.52 = 643.29/x
  3. Step 3: Cross multiply
    958.59x = 1,321.52 × 643.29
  4. Step 4: Simplify right side
    958.59x = 850,120.60
  5. Step 5: Solve for x
    x = 850,120.60/958.59
  6. Step 6: Final answer
    x = 886.84

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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.