Home / 1,990-2,965.72-1,886.32

Finding the Fourth Proportional to 1,990, 2,965.72 and 1,886.32

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Solution

The fourth proportional to 1,990, 2,965.72 and 1,886.32 is: 2,811.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990 : 2,965.72 = 1,886.32 : x
  2. Step 2: Convert to fraction form
    1,990/2,965.72 = 1,886.32/x
  3. Step 3: Cross multiply
    1,990x = 2,965.72 × 1,886.32
  4. Step 4: Simplify right side
    1,990x = 5,594,296.95
  5. Step 5: Solve for x
    x = 5,594,296.95/1,990
  6. Step 6: Final answer
    x = 2,811.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.