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Finding the Fourth Proportional to 1,382.64, 1,908.21 and 858.75

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Solution

The fourth proportional to 1,382.64, 1,908.21 and 858.75 is: 1,185.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.64 : 1,908.21 = 858.75 : x
  2. Step 2: Convert to fraction form
    1,382.64/1,908.21 = 858.75/x
  3. Step 3: Cross multiply
    1,382.64x = 1,908.21 × 858.75
  4. Step 4: Simplify right side
    1,382.64x = 1,638,675.34
  5. Step 5: Solve for x
    x = 1,638,675.34/1,382.64
  6. Step 6: Final answer
    x = 1,185.18

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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.