Home / 1,621.36-2,236.77-991.92

Finding the Fourth Proportional to 1,621.36, 2,236.77 and 991.92

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Solution

The fourth proportional to 1,621.36, 2,236.77 and 991.92 is: 1,368.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,621.36 : 2,236.77 = 991.92 : x
  2. Step 2: Convert to fraction form
    1,621.36/2,236.77 = 991.92/x
  3. Step 3: Cross multiply
    1,621.36x = 2,236.77 × 991.92
  4. Step 4: Simplify right side
    1,621.36x = 2,218,696.90
  5. Step 5: Solve for x
    x = 2,218,696.90/1,621.36
  6. Step 6: Final answer
    x = 1,368.42

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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.