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Finding the Fourth Proportional to 1,620.84, 2,236.97 and 991.25

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Solution

The fourth proportional to 1,620.84, 2,236.97 and 991.25 is: 1,368.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.84 : 2,236.97 = 991.25 : x
  2. Step 2: Convert to fraction form
    1,620.84/2,236.97 = 991.25/x
  3. Step 3: Cross multiply
    1,620.84x = 2,236.97 × 991.25
  4. Step 4: Simplify right side
    1,620.84x = 2,217,380.37
  5. Step 5: Solve for x
    x = 2,217,380.37/1,620.84
  6. Step 6: Final answer
    x = 1,368.04

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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.