Home / 2,911.71-4,019.94-2,164.80

Finding the Fourth Proportional to 2,911.71, 4,019.94 and 2,164.80

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Solution

The fourth proportional to 2,911.71, 4,019.94 and 2,164.80 is: 2,988.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,911.71 : 4,019.94 = 2,164.80 : x
  2. Step 2: Convert to fraction form
    2,911.71/4,019.94 = 2,164.80/x
  3. Step 3: Cross multiply
    2,911.71x = 4,019.94 × 2,164.80
  4. Step 4: Simplify right side
    2,911.71x = 8,702,366.11
  5. Step 5: Solve for x
    x = 8,702,366.11/2,911.71
  6. Step 6: Final answer
    x = 2,988.75

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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.