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Finding the Fourth Proportional to 955.62, 1,431.36 and 721.94

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Solution

The fourth proportional to 955.62, 1,431.36 and 721.94 is: 1,081.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.62 : 1,431.36 = 721.94 : x
  2. Step 2: Convert to fraction form
    955.62/1,431.36 = 721.94/x
  3. Step 3: Cross multiply
    955.62x = 1,431.36 × 721.94
  4. Step 4: Simplify right side
    955.62x = 1,033,348.88
  5. Step 5: Solve for x
    x = 1,033,348.88/955.62
  6. Step 6: Final answer
    x = 1,081.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.