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Finding the Fourth Proportional to 1,786.12, 2,679.58 and 862.46

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Solution

The fourth proportional to 1,786.12, 2,679.58 and 862.46 is: 1,293.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.12 : 2,679.58 = 862.46 : x
  2. Step 2: Convert to fraction form
    1,786.12/2,679.58 = 862.46/x
  3. Step 3: Cross multiply
    1,786.12x = 2,679.58 × 862.46
  4. Step 4: Simplify right side
    1,786.12x = 2,311,030.57
  5. Step 5: Solve for x
    x = 2,311,030.57/1,786.12
  6. Step 6: Final answer
    x = 1,293.88

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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.