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Finding the Fourth Proportional to 1,382.58, 1,908.54 and 858.60

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Solution

The fourth proportional to 1,382.58, 1,908.54 and 858.60 is: 1,185.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.58 : 1,908.54 = 858.60 : x
  2. Step 2: Convert to fraction form
    1,382.58/1,908.54 = 858.60/x
  3. Step 3: Cross multiply
    1,382.58x = 1,908.54 × 858.60
  4. Step 4: Simplify right side
    1,382.58x = 1,638,672.44
  5. Step 5: Solve for x
    x = 1,638,672.44/1,382.58
  6. Step 6: Final answer
    x = 1,185.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.