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Finding the Fourth Proportional to 2,805.82, 4,207.81 and 931.28

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Solution

The fourth proportional to 2,805.82, 4,207.81 and 931.28 is: 1,396.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,805.82 : 4,207.81 = 931.28 : x
  2. Step 2: Convert to fraction form
    2,805.82/4,207.81 = 931.28/x
  3. Step 3: Cross multiply
    2,805.82x = 4,207.81 × 931.28
  4. Step 4: Simplify right side
    2,805.82x = 3,918,649.30
  5. Step 5: Solve for x
    x = 3,918,649.30/2,805.82
  6. Step 6: Final answer
    x = 1,396.61

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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.