Home / 4,979.90-6,871.86-2,855.40

Finding the Fourth Proportional to 4,979.90, 6,871.86 and 2,855.40

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Solution

The fourth proportional to 4,979.90, 6,871.86 and 2,855.40 is: 3,940.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,979.90 : 6,871.86 = 2,855.40 : x
  2. Step 2: Convert to fraction form
    4,979.90/6,871.86 = 2,855.40/x
  3. Step 3: Cross multiply
    4,979.90x = 6,871.86 × 2,855.40
  4. Step 4: Simplify right side
    4,979.90x = 19,621,909.04
  5. Step 5: Solve for x
    x = 19,621,909.04/4,979.90
  6. Step 6: Final answer
    x = 3,940.22

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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.