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Finding the Fourth Proportional to 2,097.21, 3,145.82 and 728.25

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Solution

The fourth proportional to 2,097.21, 3,145.82 and 728.25 is: 1,092.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,097.21 : 3,145.82 = 728.25 : x
  2. Step 2: Convert to fraction form
    2,097.21/3,145.82 = 728.25/x
  3. Step 3: Cross multiply
    2,097.21x = 3,145.82 × 728.25
  4. Step 4: Simplify right side
    2,097.21x = 2,290,939.77
  5. Step 5: Solve for x
    x = 2,290,939.77/2,097.21
  6. Step 6: Final answer
    x = 1,092.38

Related Problems

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Double scale
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Similar ratio
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1.5x scale

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.