Home / 2,839.29-3,923.63-2,129.90

Finding the Fourth Proportional to 2,839.29, 3,923.63 and 2,129.90

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Solution

The fourth proportional to 2,839.29, 3,923.63 and 2,129.90 is: 2,943.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,839.29 : 3,923.63 = 2,129.90 : x
  2. Step 2: Convert to fraction form
    2,839.29/3,923.63 = 2,129.90/x
  3. Step 3: Cross multiply
    2,839.29x = 3,923.63 × 2,129.90
  4. Step 4: Simplify right side
    2,839.29x = 8,356,909.27
  5. Step 5: Solve for x
    x = 8,356,909.27/2,839.29
  6. Step 6: Final answer
    x = 2,943.31

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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.