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Finding the Fourth Proportional to 3,872.56, 5,807.20 and 1,274.88

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Solution

The fourth proportional to 3,872.56, 5,807.20 and 1,274.88 is: 1,911.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,872.56 : 5,807.20 = 1,274.88 : x
  2. Step 2: Convert to fraction form
    3,872.56/5,807.20 = 1,274.88/x
  3. Step 3: Cross multiply
    3,872.56x = 5,807.20 × 1,274.88
  4. Step 4: Simplify right side
    3,872.56x = 7,403,483.14
  5. Step 5: Solve for x
    x = 7,403,483.14/3,872.56
  6. Step 6: Final answer
    x = 1,911.78

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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.