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Finding the Fourth Proportional to 712.63, 1,067.66 and 669.75

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Solution

The fourth proportional to 712.63, 1,067.66 and 669.75 is: 1,003.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.63 : 1,067.66 = 669.75 : x
  2. Step 2: Convert to fraction form
    712.63/1,067.66 = 669.75/x
  3. Step 3: Cross multiply
    712.63x = 1,067.66 × 669.75
  4. Step 4: Simplify right side
    712.63x = 715,059.95
  5. Step 5: Solve for x
    x = 715,059.95/712.63
  6. Step 6: Final answer
    x = 1,003.41

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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.