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Finding the Fourth Proportional to 1,382.10, 1,905.84 and 983.58

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Solution

The fourth proportional to 1,382.10, 1,905.84 and 983.58 is: 1,356.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.10 : 1,905.84 = 983.58 : x
  2. Step 2: Convert to fraction form
    1,382.10/1,905.84 = 983.58/x
  3. Step 3: Cross multiply
    1,382.10x = 1,905.84 × 983.58
  4. Step 4: Simplify right side
    1,382.10x = 1,874,546.11
  5. Step 5: Solve for x
    x = 1,874,546.11/1,382.10
  6. Step 6: Final answer
    x = 1,356.30

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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.