Home / 1,990.32-2,979.91-1,295.25

Finding the Fourth Proportional to 1,990.32, 2,979.91 and 1,295.25

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Solution

The fourth proportional to 1,990.32, 2,979.91 and 1,295.25 is: 1,939.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.32 : 2,979.91 = 1,295.25 : x
  2. Step 2: Convert to fraction form
    1,990.32/2,979.91 = 1,295.25/x
  3. Step 3: Cross multiply
    1,990.32x = 2,979.91 × 1,295.25
  4. Step 4: Simplify right side
    1,990.32x = 3,859,728.43
  5. Step 5: Solve for x
    x = 3,859,728.43/1,990.32
  6. Step 6: Final answer
    x = 1,939.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.