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Finding the Fourth Proportional to 1,193.89, 1,647.19 and 721.97

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Solution

The fourth proportional to 1,193.89, 1,647.19 and 721.97 is: 996.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,193.89 : 1,647.19 = 721.97 : x
  2. Step 2: Convert to fraction form
    1,193.89/1,647.19 = 721.97/x
  3. Step 3: Cross multiply
    1,193.89x = 1,647.19 × 721.97
  4. Step 4: Simplify right side
    1,193.89x = 1,189,221.76
  5. Step 5: Solve for x
    x = 1,189,221.76/1,193.89
  6. Step 6: Final answer
    x = 996.09

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Half scale
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Double scale
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1.5x scale

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.