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Finding the Fourth Proportional to 1,382.28, 1,908.28 and 858.62

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Solution

The fourth proportional to 1,382.28, 1,908.28 and 858.62 is: 1,185.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.28 : 1,908.28 = 858.62 : x
  2. Step 2: Convert to fraction form
    1,382.28/1,908.28 = 858.62/x
  3. Step 3: Cross multiply
    1,382.28x = 1,908.28 × 858.62
  4. Step 4: Simplify right side
    1,382.28x = 1,638,487.37
  5. Step 5: Solve for x
    x = 1,638,487.37/1,382.28
  6. Step 6: Final answer
    x = 1,185.35

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1.5x scale

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.