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Finding the Fourth Proportional to 1,393.25, 2,091.92 and 663.35

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Solution

The fourth proportional to 1,393.25, 2,091.92 and 663.35 is: 995.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.25 : 2,091.92 = 663.35 : x
  2. Step 2: Convert to fraction form
    1,393.25/2,091.92 = 663.35/x
  3. Step 3: Cross multiply
    1,393.25x = 2,091.92 × 663.35
  4. Step 4: Simplify right side
    1,393.25x = 1,387,661.36
  5. Step 5: Solve for x
    x = 1,387,661.36/1,393.25
  6. Step 6: Final answer
    x = 995.99

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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.