Home / 3,886.80-5,363.79-2,118.40

Finding the Fourth Proportional to 3,886.80, 5,363.79 and 2,118.40

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Solution

The fourth proportional to 3,886.80, 5,363.79 and 2,118.40 is: 2,923.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,886.80 : 5,363.79 = 2,118.40 : x
  2. Step 2: Convert to fraction form
    3,886.80/5,363.79 = 2,118.40/x
  3. Step 3: Cross multiply
    3,886.80x = 5,363.79 × 2,118.40
  4. Step 4: Simplify right side
    3,886.80x = 11,362,642.14
  5. Step 5: Solve for x
    x = 11,362,642.14/3,886.80
  6. Step 6: Final answer
    x = 2,923.40

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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.