Home / 3,868.90-5,338.78-2,167.40

Finding the Fourth Proportional to 3,868.90, 5,338.78 and 2,167.40

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Solution

The fourth proportional to 3,868.90, 5,338.78 and 2,167.40 is: 2,990.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,868.90 : 5,338.78 = 2,167.40 : x
  2. Step 2: Convert to fraction form
    3,868.90/5,338.78 = 2,167.40/x
  3. Step 3: Cross multiply
    3,868.90x = 5,338.78 × 2,167.40
  4. Step 4: Simplify right side
    3,868.90x = 11,571,271.77
  5. Step 5: Solve for x
    x = 11,571,271.77/3,868.90
  6. Step 6: Final answer
    x = 2,990.84

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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.