Home / 1,620.45-2,236.14-991.08

Finding the Fourth Proportional to 1,620.45, 2,236.14 and 991.08

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Solution

The fourth proportional to 1,620.45, 2,236.14 and 991.08 is: 1,367.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.45 : 2,236.14 = 991.08 : x
  2. Step 2: Convert to fraction form
    1,620.45/2,236.14 = 991.08/x
  3. Step 3: Cross multiply
    1,620.45x = 2,236.14 × 991.08
  4. Step 4: Simplify right side
    1,620.45x = 2,216,193.63
  5. Step 5: Solve for x
    x = 2,216,193.63/1,620.45
  6. Step 6: Final answer
    x = 1,367.64

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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.