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Finding the Fourth Proportional to 1,739.35, 2,399.71 and 992.78

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Solution

The fourth proportional to 1,739.35, 2,399.71 and 992.78 is: 1,369.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,739.35 : 2,399.71 = 992.78 : x
  2. Step 2: Convert to fraction form
    1,739.35/2,399.71 = 992.78/x
  3. Step 3: Cross multiply
    1,739.35x = 2,399.71 × 992.78
  4. Step 4: Simplify right side
    1,739.35x = 2,382,378.09
  5. Step 5: Solve for x
    x = 2,382,378.09/1,739.35
  6. Step 6: Final answer
    x = 1,369.69

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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.