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Finding the Fourth Proportional to 853.36, 1,278.84 and 669.92

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Solution

The fourth proportional to 853.36, 1,278.84 and 669.92 is: 1,003.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.36 : 1,278.84 = 669.92 : x
  2. Step 2: Convert to fraction form
    853.36/1,278.84 = 669.92/x
  3. Step 3: Cross multiply
    853.36x = 1,278.84 × 669.92
  4. Step 4: Simplify right side
    853.36x = 856,720.49
  5. Step 5: Solve for x
    x = 856,720.49/853.36
  6. Step 6: Final answer
    x = 1,003.94

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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.