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Finding the Fourth Proportional to 3,873.71, 5,811.78 and 1,278.47

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Solution

The fourth proportional to 3,873.71, 5,811.78 and 1,278.47 is: 1,918.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,873.71 : 5,811.78 = 1,278.47 : x
  2. Step 2: Convert to fraction form
    3,873.71/5,811.78 = 1,278.47/x
  3. Step 3: Cross multiply
    3,873.71x = 5,811.78 × 1,278.47
  4. Step 4: Simplify right side
    3,873.71x = 7,430,157.32
  5. Step 5: Solve for x
    x = 7,430,157.32/3,873.71
  6. Step 6: Final answer
    x = 1,918.10

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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.