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Finding the Fourth Proportional to 1,086.56, 1,629.40 and 858.14

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Solution

The fourth proportional to 1,086.56, 1,629.40 and 858.14 is: 1,286.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.56 : 1,629.40 = 858.14 : x
  2. Step 2: Convert to fraction form
    1,086.56/1,629.40 = 858.14/x
  3. Step 3: Cross multiply
    1,086.56x = 1,629.40 × 858.14
  4. Step 4: Simplify right side
    1,086.56x = 1,398,253.32
  5. Step 5: Solve for x
    x = 1,398,253.32/1,086.56
  6. Step 6: Final answer
    x = 1,286.86

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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.