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Finding the Fourth Proportional to 1,811.88, 2,711.64 and 1,256.78

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Solution

The fourth proportional to 1,811.88, 2,711.64 and 1,256.78 is: 1,880.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.88 : 2,711.64 = 1,256.78 : x
  2. Step 2: Convert to fraction form
    1,811.88/2,711.64 = 1,256.78/x
  3. Step 3: Cross multiply
    1,811.88x = 2,711.64 × 1,256.78
  4. Step 4: Simplify right side
    1,811.88x = 3,407,924.50
  5. Step 5: Solve for x
    x = 3,407,924.50/1,811.88
  6. Step 6: Final answer
    x = 1,880.88

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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.